In the 9th century, during the

Arab–Byzantine wars The Arab–Byzantine wars were a series of wars between a number of Muslim Arab dynasties and the Byzantine Empire between the 7th and 11th centuries AD. Conflict started during the initial Muslim conquests, under the expansionist Rashidun and ...

, the

Byzantine Empire 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 Constantin ...

used a

semaphore Semaphore (; ) is the use of an apparatus to create a visual signal transmitted over distance. A semaphore can be performed with devices including: fire, lights, flags, sunlight, and moving arms. Semaphores can be used for telegraphy when ar ...

system of

beacon A beacon is an intentionally conspicuous device designed to attract attention to a specific location. A common example is the lighthouse, which draws attention to a fixed point that can be used to navigate around obstacles or into port. More mode ...

s to transmit messages from the border with the

Abbasid Caliphate The Abbasid Caliphate ( or ; ar, الْخِلَافَةُ الْعَبَّاسِيَّة, ') was the third caliphate to succeed the Islamic prophet Muhammad. It was founded by a dynasty descended from Muhammad's uncle, Abbas ibn Abdul-Mutta ...

across

Asia Minor Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The ...

to the Byzantine capital,

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 ( ...

. According to the Byzantine sources ( Constantine Porphyrogenitus,

Theophanes Continuatus ''Theophanes Continuatus'' ( el, συνεχισταί Θεοφάνους) or ''Scriptores post Theophanem'' (, "those after Theophanes") is the Latin name commonly applied to a collection of historical writings preserved in the 11th-century Vat. g ...

and

Symeon Magister Symeon Logothete (or Symeon Magister) was a 10th-century Byzantine Greek historian and poet. Symeon wrote a world chronicle that goes from Creation to the year 948.It has been misattributed to one Theodosius of Melitene and also to Leo Grammaticu ...

), the line of beacons began with the fortress of Loulon, on the northern exit of the

Cilician Gates The Cilician Gates or Gülek Pass is a pass through the Taurus Mountains connecting the low plains of Cilicia to the Anatolian Plateau, by way of the narrow gorge of the Gökoluk River. Its highest elevation is about 1000m. The Cilician Gates ...

, and continued with Mt. Argaios (identified mostly with Keçikalesı on

Hasan Dağı Mount Hasan ( tr, Hasan Dağı) is a volcano in Anatolia, Turkey. It has two summits, the high eastern Small Hasan Dagi and the high Big Hasan Dagi, and rises about above the surrounding terrain. It consists of various volcanic deposits, includ ...

, but also with Erciyes Dağı near

Caesarea Caesarea () ( he, קֵיסָרְיָה, ), ''Keysariya'' or ''Qesarya'', often simplified to Keisarya, and Qaysaria, is an affluent town in north-central Israel, which inherits its name and much of its territory from the ancient city of Caesare ...

), Mt. Samos or Isamos (unidentified, probably north of Lake Tatta), the fortress of Aigilon (unidentified, probably south of Dorylaion), Mt. Mamas (unidentified, Constantine Porphyrogenitus has Mysian Olympus instead), Mt. Kyrizos (somewhere between Lake Ascania and the Gulf of Kios, possibly Katerlı Dağı according to W. M. Ramsay), Mt. Mokilos above Pylae on the southern shore of the Gulf of Nicomedia (identified by Ramsay with Samanlı Dağı), Mt. Saint Auxentius (modern Kayış Dağı) south-east of

Chalcedon Chalcedon ( or ; , sometimes transliterated as ''Chalkedon'') was an ancient maritime town of Bithynia, in Asia Minor. It was located almost directly opposite Byzantium, south of Scutari (modern Üsküdar) and it is now a district of the c ...

(modern Kadıköy) and the lighthouse (''Pharos'') of the

Great Palace The Great Palace of Constantinople ( el, Μέγα Παλάτιον, ''Méga Palátion''; Latin: ''Palatium Magnum''), also known as the Sacred Palace ( el, Ἱερὸν Παλάτιον, ''Hieròn Palátion''; Latin: ''Sacrum Palatium''), was th ...

in Constantinople.Toynbee (1973), p. 299 This main line was complemented by secondary branches that transmitted the messages to other locations, as well as along the frontier itself.Foss (1991), pp. 273–274 The main line of beacons stretched over some . In the open spaces of central

, the stations were placed over apart, while in

Bithynia Bithynia (; Koine Greek: , ''Bithynía'') was an ancient region, kingdom and Roman province in the northwest of Asia Minor (present-day Turkey), adjoining the Sea of Marmara, the Bosporus, and the Black Sea. It bordered Mysia to the sout ...

, with its more broken terrain, the intervals were reduced to ca. . Based on modern experiments, a message could be transmitted the entire length of the line within an hour. The system was reportedly devised in the reign of Emperor Theophilos (ruled 829–842) by Leo the Mathematician, and functioned through two identical

water clocks A water clock or clepsydra (; ; ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount is then measured. Water clocks are one of the oldest time-m ...

placed at the two terminal stations, Loulon and the Lighthouse. Different messages were assigned to each of twelve hours, so that the lighting of a

bonfire A bonfire is a large and controlled outdoor fire, used either for informal disposal of burnable waste material or as part of a celebration. Etymology The earliest recorded uses of the word date back to the late 15th century, with the Cath ...

on the first beacon on a particular hour signalled a specific event and was transmitted down the line to Constantinople. According to some of the Byzantine chroniclers, the system was disbanded by Theophilos' son and successor, Michael III (r. 842–867) because the sight of the lit beacons and the news of an Arab invasion threatened to distract the people and spoil his performance as one of the charioteers in the

Hippodrome The hippodrome ( el, ἱππόδρομος) was an ancient Greek stadium for horse racing and chariot racing. The name is derived from the Greek words ''hippos'' (ἵππος; "horse") and ''dromos'' (δρόμος; "course"). The term is used ...

races. This tale is usually dismissed by modern scholars as part of a deliberate propaganda campaign by 10th-century sources keen to blacken Michael's image in favour of the succeeding

Macedonian dynasty The Macedonian dynasty (Greek: Μακεδονική Δυναστεία) ruled the Byzantine Empire from 867 to 1056, following the Amorian dynasty. During this period, the Byzantine state reached its greatest extent since the Muslim conquests, ...

.Toynbee (1973), pp. 299–300, 582ff. If indeed there is some element of truth in this report, it may reflect a cutting-back or modification of the system, perhaps due to the receding of the Arab danger during Michael III's reign. The surviving portions of the system or a new but similar one seem to have been reactivated under

Manuel I Komnenos Manuel I Komnenos ( el, Μανουήλ Κομνηνός, translit=Manouíl Komnenos, translit-std=ISO; 28 November 1118 – 24 September 1180), Latinized Comnenus, also called Porphyrogennetos (; " born in the purple"), was a Byzantine empero ...

(r. 1143–1180).

Citations

General and cited sources

* * * {{Cite book , last = Toynbee , first = Arnold , authorlink = Arnold J. Toynbee , title = Constantine Porphyrogenitus and His World , year = 1973 , location = London and New York , publisher = Oxford University Press , isbn = 0-19-215253-X 9th century in the Byzantine Empire Beacon system Beacons Byzantine Anatolia History of telecommunications Semaphore Signalling lights Warning systems

See also

Citations

General and cited sources