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Rabban Bar Ṣawma (
Syriac language The Syriac language (; syc, / '), also known as Syriac Aramaic (''Syrian Aramaic'', ''Syro-Aramaic'') and Classical Syriac ܠܫܢܐ ܥܬܝܩܐ (in its literary and liturgical form), is an Aramaic language, Aramaic dialect that emerged during ...
: , ; 1220January 1294), also known as Rabban Ṣawma or Rabban ÇaumaMantran, p. 298 (), was a Turkic Chinese ( Uyghur or possibly Ongud) monk turned diplomat of the "Nestorian"
Church of the East in China The Church of the East (also known as the Nestorian Church) historically had a presence in China during two periods: first from the 7th through the 10th century in the Tang dynasty, when it was known as ''Jingjiao'' ( zh, t=景教, w=Ching3-chiao4 ...
. He is known for embarking on a pilgrimage from Yuan China to
Jerusalem Jerusalem (; he, יְרוּשָׁלַיִם ; ar, القُدس ) (combining the Biblical and common usage Arabic names); grc, Ἱερουσαλήμ/Ἰεροσόλυμα, Hierousalḗm/Hierosóluma; hy, Երուսաղեմ, Erusałēm. i ...
with one of his students, Rabban Markos. Due to military unrest along the way, they never reached their destination, but instead spent many years in
Ilkhanate The Ilkhanate, also spelled Il-khanate ( fa, ایل خانان, ''Ilxānān''), known to the Mongols as ''Hülegü Ulus'' (, ''Qulug-un Ulus''), was a khanate established from the southwestern sector of the Mongol Empire. The Ilkhanid realm ...
-controlled
Baghdad Baghdad (; ar, بَغْدَاد , ) is the capital of Iraq and the second-largest city in the Arab world after Cairo. It is located on the Tigris near the ruins of the ancient city of Babylon and the Sassanid Persian capital of Ctesiphon ...
. The younger Markos was eventually elected
Yahballaha III Yahballaha III ( 1245–13 November 1317), known in earlier years as Rabban Marcos (or Markos) or Yahballaha V, was Patriarch of the East from 1281 to 1317. As patriarch, Yahballaha headed the Church of the East during the severe persecut ...
, Patriarch of the Church of the East and later suggested his teacher Rabban Bar Ṣawma be sent on another mission, as Mongol ambassador to Europe. The elderly monk met with many of the European monarchs, as well as the Pope, in attempts to arrange a Franco-Mongol alliance. The mission bore no fruit, but in his later years in Baghdad, Rabban Bar Ṣawma documented his lifetime of travel. His written account of his journeys is of unique interest to modern historians, as it gives a picture of
medieval Europe In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
at the close of the
Crusades The Crusades were a series of religious wars initiated, supported, and sometimes directed by the Latin Church in the medieval period. The best known of these Crusades are those to the Holy Land in the period between 1095 and 1291 that were ...
, painted by a keenly-intelligent, broadminded, and statesmanlike observer. Bar Ṣawma's travels occurred prior to the return of
Marco Polo Marco Polo (, , ; 8 January 1324) was a Venetian merchant, explorer and writer who travelled through Asia along the Silk Road between 1271 and 1295. His travels are recorded in '' The Travels of Marco Polo'' (also known as ''Book of the Marv ...
to Europe, and his writings give a reverse viewpoint, of the East looking to the West.


Early life

Rabban ("Master"; c.f. Hebrew "''
Rabbi A rabbi () is a spiritual leader or religious teacher in Judaism. One becomes a rabbi by being ordained by another rabbi – known as '' semikha'' – following a course of study of Jewish history and texts such as the Talmud. The basic form o ...
''" in Judaism) Bar Ṣawma was born c. 1220 in or near modern-day Beijing, known then as
Zhongdu Zhongdu (, lit. "Central Capital") was the capital of the Jurchen-led Jin dynasty in medieval China. It was located in the southwestern part of Beijing's Xicheng District. It had a population of nearly one million by the late 12th century, and ...
,Kathleen Kuiper & editors of Encyclopædia Britannica (31 August 2006).
Rabban bar Sauma: Mongol Envoy
" ''Encyclopædia Britannica'' (online source). Retrieved 6 September 2016.
later as
Khanbaliq Khanbaliq or Dadu of Yuan () was the winter capital of the Yuan dynasty of China in what is now Beijing, also the capital of the People's Republic of China today. It was located at the center of modern Beijing. The Secretariat directly admini ...
under Mongol rule. According to Bar Hebraeus he was of Uyghur origin. Chinese accounts describe his heritage as Öngüd, a
Turkic people The Turkic peoples are a collection of diverse ethnic groups of West Asia, West, Central Asia, Central, East Asia, East, and North Asia as well as parts of Europe, who speak Turkic languages.. "Turkic peoples, any of various peoples whose memb ...
classified as members of the "Mongol" caste under Yuan law. The name ''bar Ṣawma'' is Aramaic for "Son of Fasting" though he was born to a wealthy family. He was a " Church of the East Christian", and became an ascetic monk around the age of 20 and then a religious teacher for decades.


Pilgrimage to Jerusalem

In his middle age, Rabban Bar Sauma and one of his younger students, Rabban Markos, embarked on a journey from Yuan China to make pilgrimage to
Jerusalem Jerusalem (; he, יְרוּשָׁלַיִם ; ar, القُدس ) (combining the Biblical and common usage Arabic names); grc, Ἱερουσαλήμ/Ἰεροσόλυμα, Hierousalḗm/Hierosóluma; hy, Երուսաղեմ, Erusałēm. i ...
. They traveled by way of the former Tangut country,
Khotan Hotan (also known as Gosthana, Gaustana, Godana, Godaniya, Khotan, Hetian, Hotien) is a major oasis town in southwestern Xinjiang, an autonomous region in Western China. The city proper of Hotan broke off from the larger Hotan County to become ...
,
Kashgar Kashgar ( ug, قەشقەر, Qeshqer) or Kashi ( zh, c=喀什) is an oasis city in the Tarim Basin region of Southern Xinjiang. It is one of the westernmost cities of China, near the border with Afghanistan, Kyrgyzstan, Tajikistan and Pakistan. ...
,
Taraz Taraz ( kz, Тараз, تاراز, translit=Taraz ; known to Europeans as Talas) is a city and the administrative center of Jambyl Region in Kazakhstan, located on the Talas (Taraz) River in the south of the country near the border with Kyrgy ...
in the
Syr Darya The Syr Darya (, ),, , ; rus, Сырдарья́, Syrdarjja, p=sɨrdɐˈrʲja; fa, سيردريا, Sirdaryâ; tg, Сирдарё, Sirdaryo; tr, Seyhun, Siri Derya; ar, سيحون, Seyḥūn; uz, Sirdaryo, script-Latn/. historically known ...
valley,
Khorasan Khorasan may refer to: * Greater Khorasan, a historical region which lies mostly in modern-day northern/northwestern Afghanistan, northeastern Iran, southern Turkmenistan, Tajikistan, and Uzbekistan * Khorasan Province, a pre-2004 province of Ira ...
(now
Afghanistan Afghanistan, officially the Islamic Emirate of Afghanistan,; prs, امارت اسلامی افغانستان is a landlocked country located at the crossroads of Central Asia and South Asia. Referred to as the Heart of Asia, it is borde ...
),
Maragha Maragheh ( fa, مراغه, Marāgheh or ''Marāgha''; az, ماراغا ) is a city and capital of Maragheh County, East Azerbaijan Province, Iran. Maragheh is on the bank of the river Sufi Chay. The population consists mostly of Iranian Azerba ...
(now
Azerbaijan Azerbaijan (, ; az, Azərbaycan ), officially the Republic of Azerbaijan, , also sometimes officially called the Azerbaijan Republic is a transcontinental country located at the boundary of Eastern Europe and Western Asia. It is a part of th ...
) and
Mosul Mosul ( ar, الموصل, al-Mawṣil, ku, مووسڵ, translit=Mûsil, Turkish: ''Musul'', syr, ܡܘܨܠ, Māwṣil) is a major city in northern Iraq, serving as the capital of Nineveh Governorate. The city is considered the second larg ...
, arriving at Ani in the
Kingdom of Georgia The Kingdom of Georgia ( ka, საქართველოს სამეფო, tr), also known as the Georgian Empire, was a medieval Eurasian monarchy that was founded in circa 1008 AD. It reached its Golden Age of political and economic ...
. Warnings of danger on the routes to southern
Syria Syria ( ar, سُورِيَا or سُورِيَة, translit=Sūriyā), officially the Syrian Arab Republic ( ar, الجمهورية العربية السورية, al-Jumhūrīyah al-ʻArabīyah as-Sūrīyah), is a Western Asian country loc ...
turned them from their purpose, and they traveled to Mongol-controlled Persia, the
Ilkhanate The Ilkhanate, also spelled Il-khanate ( fa, ایل خانان, ''Ilxānān''), known to the Mongols as ''Hülegü Ulus'' (, ''Qulug-un Ulus''), was a khanate established from the southwestern sector of the Mongol Empire. The Ilkhanid realm ...
, where they were welcomed by Patriarch
Denha I Mar Denha I (also written Dinkha I) was Patriarch of the Church of the East (sometimes referred to as the Nestorian church) from 1265 to 1281. He was widely suspected of murdering Shem'on Bar Qaligh, bishop of Tus, and was remembered by later g ...
of the Church of the East. The Patriarch requested the two monks to visit the court of the Mongol Ilkhanate ruler
Abaqa Khan Abaqa Khan (27 February 1234 – 4 April 1282, mn, Абаха/Абага хан (Khalkha Cyrillic), ( Traditional script), "paternal uncle", also transliterated Abaġa), was the second Mongol ruler (''Ilkhan'') of the Ilkhanate. The son of Hul ...
, to obtain confirmation letters for Mar Denha's ordination as Patriarch in 1266. During the journey, Rabban Markos was declared a "Nestorian" bishop. The Patriarch then attempted to send the monks as messengers back to China, but military conflict along the route delayed their departure, and they remained in Baghdad. When the Patriarch died, Rabban Markos was elected as his replacement,
Yahballaha III Yahballaha III ( 1245–13 November 1317), known in earlier years as Rabban Marcos (or Markos) or Yahballaha V, was Patriarch of the East from 1281 to 1317. As patriarch, Yahballaha headed the Church of the East during the severe persecut ...
, in 1281. The two monks traveled to
Maragheh Maragheh ( fa, مراغه, Marāgheh or ''Marāgha''; az, ماراغا ) is a city and capital of Maragheh County, East Azerbaijan Province, Iran. Maragheh is on the bank of the river Sufi Chay. The population consists mostly of Iranian Azerba ...
to have the selection confirmed by Abaqa, but the Ilkhanate khan died before their arrival, and was succeeded by his son,
Arghun Arghun Khan (Mongolian Cyrillic: ''Аргун хан''; Traditional Mongolian: ; c. 1258 – 10 March 1291) was the fourth ruler of the Mongol empire's Ilkhanate, from 1284 to 1291. He was the son of Abaqa Khan, and like his father, was a dev ...
. It was Arghun's desire to form a strategic Franco-Mongol alliance with the Christian Europeans against their common enemy, the Muslim Mamluk Sultanate at Cairo. A few years later, the new patriarch Yahballaha III suggested his former teacher Rabban Bar Ṣawma for the embassy, to meet with the Pope and the European monarchs.


Ambassador to Europe

In 1287, the elderly Bar Sauma embarked on his journey to Europe, bearing gifts and letters from Arghun to the
Eastern Roman The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantinopl ...
emperor, the Pope, and the European kings. He followed the embassy of another "
Nestorian Nestorianism is a term used in Christian theology and Church history to refer to several mutually related but doctrinarily distinct sets of teachings. The first meaning of the term is related to the original teachings of Christian theologian ...
", Isa Kelemechi, sent by Arghun to
Pope Honorius IV Pope Honorius IV (c. 1210 – 3 April 1287), born Giacomo Savelli, was head of the Catholic Church and ruler of the Papal States from 2 April 1285 to his death in 1287. During his pontificate he largely continued to pursue the pro-French poli ...
, in 1285.''The Mongols and the West, 1221–1410'' Peter Jackson p.169
/ref>''The Cambridge history of Iran'' William Bayne Fisher, John Andrew Boyle p.370
/ref> Rabban Bar Sauma traveled with a large retinue of assistants, and 30 riding animals. Companions included the Church of the East Christian (''archaon'') Sabadinus; Thomas de Anfusis (or Tommaso d'Anfossi), who helped as interpreter and was also a member of a famous Genoese banking company;Phillips, p. 102 and an Italian interpreter named Uguetus or Ugeto (Ughetto). Bar Sauma likely did not speak any European languages, though he was known to be fluent in Chinese, Turkic, and Persian, and he was able to read Syriac. Europeans communicated to him in Persian. He traveled overland through Armenia to either the
Empire of Trebizond The Empire of Trebizond, or Trapezuntine Empire, was a monarchy and one of three successor rump states of the Byzantine Empire, along with the Despotate of the Morea and the Principality of Theodoro, that flourished during the 13th through ...
or through the
Sultanate of Rum fa, سلجوقیان روم () , status = , government_type = Hereditary monarchyTriarchy (1249–1254) Diarchy (1257–1262) , year_start = 1077 , year_end = 1308 , p1 = B ...
to the Simisso on the
Black Sea The Black Sea is a marginal mediterranean sea of the Atlantic Ocean lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Rom ...
, then by boat to
Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya (Arabic), Basileuousa ("Queen of Cities"), Megalopolis (" ...
, where he had an audience with Andronicus II Palaeologus. Bar Sauma's writings give a particularly enthusiastic description of the beautiful
Hagia Sophia Hagia Sophia ( 'Holy Wisdom'; ; ; ), officially the Hagia Sophia Grand Mosque ( tr, Ayasofya-i Kebir Cami-i Şerifi), is a mosque and major cultural and historical site in Istanbul, Turkey. The cathedral was originally built as a Greek Ortho ...
. He next traveled to Italy, again journeying by ship. As their course took them past the island of
Sicily (man) it, Siciliana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Ethnicity , demographics1_footnotes = , demographi ...
, he witnessed and recorded the great eruption of
Mount Etna Mount Etna, or simply Etna ( it, Etna or ; scn, Muncibbeḍḍu or ; la, Aetna; grc, Αἴτνα and ), is an active stratovolcano on the east coast of Sicily, Italy, in the Metropolitan City of Catania, between the cities of Messina ...
on 18 June 1287. A few days after his arrival, he also witnessed a naval battle in the Bay of Sorrento on St. John's Day, 24 June 1287, during the conflict of the
Sicilian Vespers The Sicilian Vespers ( it, Vespri siciliani; scn, Vespiri siciliani) was a successful rebellion on the island of Sicily that broke out at Easter 1282 against the rule of the French-born king Charles I of Anjou, who had ruled the Kingdom of ...
. The battle was between the fleet of Charles II (whom he calls ''Irid Shardalo'', i.e. "Il re Charles Due"), who had welcomed him in his realm, and
James II of Aragon James II (Catalan: ''Jaume II''; Spanish: ''Jaime II;'' 10 April 1267 – 2 or 5 November 1327), called the Just,, an, Chaime lo Chusto, es, Jaime el Justo. was the King of Aragon and Valencia and Count of Barcelona from 1291 to 1327. He ...
, king of
Sicily (man) it, Siciliana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Ethnicity , demographics1_footnotes = , demographi ...
(whom he calls ''Irid Arkon'', i.e. "Il re de Aragon"). According to Bar Sauma, James II was victorious, and his forces killed 12,000 men. He next traveled to Rome, but too late to meet Pope
Honorius IV Pope Honorius IV (c. 1210 – 3 April 1287), born Giacomo Savelli, was head of the Catholic Church and ruler of the Papal States from 2 April 1285 to his death in 1287. During his pontificate he largely continued to pursue the pro-French politi ...
, who had recently died. So Bar Sauma instead engaged in negotiations with the cardinals, and visited St. Peter's Basilica. Bar Sauma next made stops in
Tuscany it, Toscano (man) it, Toscana (woman) , population_note = , population_blank1_title = , population_blank1 = , demographics_type1 = Citizenship , demographics1_footnotes = , demographics1_title1 = Italian , demogra ...
(''Thuzkan'') and the
Republic of Genoa The Republic of Genoa ( lij, Repúbrica de Zêna ; it, Repubblica di Genova; la, Res Publica Ianuensis) was a medieval and early modern maritime republic from the 11th century to 1797 in Liguria on the northwestern Italian coast. During the La ...
, on his way to Paris. He spent the winter of 1287–1288 in Genoa, a famous banking capital. In France (''Frangestan''), he spent one month with King
Philip the Fair Philip IV (April–June 1268 – 29 November 1314), called Philip the Fair (french: Philippe le Bel), was King of France from 1285 to 1314. By virtue of his marriage with Joan I of Navarre, he was also King of Navarre as Philip I from 12 ...
, who seemingly responded positively to the arrival of the Mongol embassy, gave him numerous presents, and sent one of his noblemen, Gobert de Helleville, to accompany Bar Sauma back to Mongol lands. Gobert de Helleville departed on 2 February 1288, with
clercs
' Robert de Senlis and Guillaume de Bruyères, as well as
l'arbalétrier
' (crossbowman) Audin de Bourges. They joined Bar Sauma when he later returned through Rome, and accompanied him back to Persia. In
Gascony Gascony (; french: Gascogne ; oc, Gasconha ; eu, Gaskoinia) was a province of the southwestern Kingdom of France that succeeded the Duchy of Gascony (602–1453). From the 17th century until the French Revolution (1789–1799), it was part ...
in southern France, which at that time was in English hands, Bar Sauma met King
Edward I of England Edward I (17/18 June 1239 – 7 July 1307), also known as Edward Longshanks and the Hammer of the Scots, was King of England and Lord of Ireland from 1272 to 1307. Concurrently, he ruled the duchies of Aquitaine and Gascony as a va ...
, probably in the capital of
Bordeaux Bordeaux ( , ; Gascon oc, Bordèu ; eu, Bordele; it, Bordò; es, Burdeos) is a port city on the river Garonne in the Gironde department, Southwestern France. It is the capital of the Nouvelle-Aquitaine region, as well as the prefectu ...
. Edward responded enthusiastically to the embassy, but ultimately proved unable to join a military alliance due to conflict at home, especially with the
Welsh Welsh may refer to: Related to Wales * Welsh, referring or related to Wales * Welsh language, a Brittonic Celtic language spoken in Wales * Welsh people People * Welsh (surname) * Sometimes used as a synonym for the ancient Britons (Celtic peopl ...
and the Scots. Upon returning to Rome, Bar Sauma was cordially received by the newly elected
Pope Nicholas IV Pope Nicholas IV ( la, Nicolaus IV; 30 September 1227 – 4 April 1292), born Girolamo Masci, was head of the Catholic Church and ruler of the Papal States from 22 February 1288 to his death on 4 April 1292. He was the first Franciscan to be ele ...
, who gave him communion on
Palm Sunday Palm Sunday is a Christian moveable feast that falls on the Sunday before Easter. The feast commemorates Christ's triumphal entry into Jerusalem, an event mentioned in each of the four canonical Gospels. Palm Sunday marks the first day of Hol ...
, 1288, allowing him to celebrate his own
Eucharist The Eucharist (; from Greek , , ), also known as Holy Communion and the Lord's Supper, is a Christian rite that is considered a sacrament in most churches, and as an ordinance in others. According to the New Testament, the rite was institu ...
in the capital of Latin Christianity. Nicholas commissioned Bar Sauma to visit the Christians of the East, and entrusted to him a precious tiara to be presented to Mar Yahballaha (Rabban Bar Sauma's former student, Markos). Bar Sauma then returned to Baghdad in 1288, carrying messages and many other gifts from the various European leaders. The delivered letters were in turn answered by Arghun in 1289, forwarded by the Genoese merchant Buscarello de Ghizolfi, a diplomatic agent for the Il-khans. In the letter to Philip IV, Arghun mentions Bar Sauma:Encyclopedia Iranic
Source
The exchanges towards the formation of an alliance with the Europeans ultimately proved fruitless, and Arghun's attempts were eventually abandoned. However, Rabban Bar Sauma did succeed in making some important contacts which encouraged communication and trade between the East and West. Aside from King Philip's embassy to the Mongols, the Papacy also sent missionaries such as
Giovanni da Montecorvino John of Montecorvino or Giovanni da Montecorvino in Italian (1247 – 1328) was an Italian Franciscan missionary, traveller and statesman, founder of the earliest Latin Catholic Church, Latin Catholic Mission (Christian), missions in India and C ...
to the Mongol court.


Later years

After his embassy to Europe, Bar Sauma lived out the rest of his years in Baghdad. It was probably during this time that he wrote the account of his travels, which was published in French in 1895 and in English in 1928 as ''The Monks of Kublai Khan, Emperor of China'' or ''The History of the Life and Travels of Rabban Sawma, Envoy and Plenipotentiary of the Mongol Khans to the Kings of Europe, and Markos Who as Mar Yahbh-Allaha III Became Patriarch of the
Church of the East The Church of the East ( syc, ܥܕܬܐ ܕܡܕܢܚܐ, ''ʿĒḏtā d-Maḏenḥā'') or the East Syriac Church, also called the Church of Seleucia-Ctesiphon, the Persian Church, the Assyrian Church, the Babylonian Church or the Nestorian C ...
in Asia'', translated and edited by Sir E. A. Wallis Budge. The narrative is unique for its observations of medieval Europe during the end of the Crusading period, through the eyes of an observant outsider from a culture thousands of miles away. Rabban Bar Sauma died in 1294, in Baghdad.


See also

*
Church of the East in China The Church of the East (also known as the Nestorian Church) historically had a presence in China during two periods: first from the 7th through the 10th century in the Tang dynasty, when it was known as ''Jingjiao'' ( zh, t=景教, w=Ching3-chiao4 ...
*
Catholic Church in China The Catholic Church in China (called Tiānzhǔ Jiào, 天主敎, literally "Religion of the Lord of Heaven" after the Chinese term for the Christian God) has a long and complicated history. John of Montecorvino was the first Roman Catholi ...
*
John of Montecorvino John of Montecorvino or Giovanni da Montecorvino in Italian (1247 – 1328) was an Italian Franciscan missionary, traveller and statesman, founder of the earliest Latin Catholic missions in India and China, and archbishop of Peking. He convert ...
* Odoric of Pordenone


Notes


References

* Beazley, C. R., ''Dawn of Modern Geography'', ii.15, 352; iii.12, 189–190, 539–541. * * Chabot, J. B.'s translation and edition of the ''Histoire du Patriarche Mar Jabalaha III. et du moine Rabban Cauma'' (from the Syriac) in '' Revue de l'Orient Latin'', 1893, pp. 566–610; 1894, pp. 73–143, 235–300 * * Odericus Raynaldus, '' Annales Ecclesiastici'' (continuation of Baronius), AD 1288, f xxxv-xxxvi; 1289, lxi * *''Records of the Wardrobe and Household, 1286-89'', ed. Byerly and Byerly (HMSO, 1986), nos. 543, 1082 (for the meeting with Edward I at St Sever). * * Wadding, Luke, ''Annales Minorum'', v.169, 196, 170-173 * Zehiroglu, Ahmet M. (2014)
"Bar Sauma's Black Sea Journey"


Translations

Rabban Bar Sauma's travel narrative has been translated into English twice: * Montgomery, James A., ''History of Yaballaha III'', (New York: Columbia University Press, 1927) * Budge, E. A. Wallis, ''The Monks of Kublai Khan'', (London: Religious Tract Society, 1928)
Online
A critical edition of the Syriac text with an English translation was published in 2021: * Borbone, Pier Giorgio, ''History of Mar Yahballaha and Rabban Sauma. Edited, translated, and annotated by -'', (Hamburg, Verlag tredition, 2021)


External links

*

{{DEFAULTSORT:Sauma, Rabban 1220 births 1294 deaths 13th-century explorers 13th-century diplomats 13th-century Christians 13th-century Turkic people Chinese Christians Nestorians Mongol Empire Christians Uyghur Christian clergy People in Christian ecumenism Medieval travel writers