Gregorio di Montelongo (or da Monte Longo; c. 1200 – 1269) was the

Bishop of Tripoli A bishop is an ordained member of the clergy who is entrusted with a position of authority and oversight in a religious institution. In Christianity, bishops are normally responsible for the governance and administration of dioceses. The role ...

from 1249 until 1251 and the

Patriarch of Aquileia This is a list of bishops and patriarchs of Aquileia in northeastern Italy. For the ecclesiastical history of the diocese, see Patriarchate of Aquileia. From 553 until 698 the archbishops renounced Papal authority as part of the Schism of the T ...

from 1251 until his death. Gregorio was born in

Ferentino Ferentino is a town and ''comune'' in Italy, in the province of Frosinone, Lazio, southeast of Rome. It is situated on a hill above sea level, in the Monti Ernici area. History ''Ferentinum'' was a town of the Hernici; it was captured from them ...

into a family related to the

counts of Segni The counts of Segni (, , also known as ''Conti'' or ''De Comitibus'' for short) were an important noble family of medieval and early modern Italy originating in Segni, Lazio. Many members of the family acted as military commanders or ecclesiastica ...

, original of Montelongo in

Molise Molise ( , ; ; , ) is a Regions of Italy, region in Southern Italy. Until 1963, it formed part of the region of Abruzzi e Molise together with Abruzzo. The split, which did not become effective until 1970, makes Molise the newest region in Ital ...

. He was papal legate in

Lombardy The Lombardy Region (; ) is an administrative regions of Italy, region of Italy that covers ; it is located in northern Italy and has a population of about 10 million people, constituting more than one-sixth of Italy's population. Lombardy is ...

since 1238, where he led the

Guelph Guelph ( ; 2021 Canadian Census population 143,740) is a city in Southwestern Ontario, Canada. Known as The Royal City, it is roughly east of Kitchener, Ontario, Kitchener and west of Downtown Toronto, at the intersection of Ontario Highway 6, ...

coalition against emperor Frederick II. In 1247 he was sent by

Pope Innocent IV Pope Innocent IV (; – 7 December 1254), born Sinibaldo Fieschi, was head of the Catholic Church and ruler of the Papal States from 25 June 1243 to his death in 1254. Fieschi was born in Genoa and studied at the universities of Parma and Bolo ...

Parma Parma (; ) is a city in the northern Italian region of Emilia-Romagna known for its architecture, Giuseppe Verdi, music, art, prosciutto (ham), Parmesan, cheese and surrounding countryside. With a population of 198,986 inhabitants as of 2025, ...

, to lead the city's defense during the imperial siege. In 1251 he was named patriarch of Aquileia, but was consecrated only five years later. He also led the anti-Hohenstaufen party in the region when Frederick's heir,

Conrad IV of Germany Conrad (25 April 1228 – 21 May 1254), a member of the Hohenstaufen dynasty, was the only son of Emperor Frederick II from his second marriage with Queen Isabella II of Jerusalem. He inherited the title of King of Jerusalem (as Conrad II) u ...

, incited the

Istria Istria ( ; Croatian language, Croatian and Slovene language, Slovene: ; Italian language, Italian and Venetian language, Venetian: ; ; Istro-Romanian language, Istro-Romanian: ; ; ) is the largest peninsula within the Adriatic Sea. Located at th ...

communes A commune is an alternative term for an intentional community. Commune or comună or comune or other derivations may also refer to: Administrative-territorial entities * Commune (administrative division), a municipality or township ** Communes of ...

to revolt. Gregorio also participated in the "crusade" against

Ezzelino III da Romano Ezzelino III da Romano (25 April 1194, Tombolo, Veneto, Tombolo7 October 1259) was an Italian feudal lord, a member of the Ezzelini family, in the March of Treviso (in modern Veneto). He was a close ally of the emperor Frederick II, Holy Roman ...

, leading personally the defense of

Padua Padua ( ) is a city and ''comune'' (municipality) in Veneto, northern Italy, and the capital of the province of Padua. The city lies on the banks of the river Bacchiglione, west of Venice and southeast of Vicenza, and has a population of 20 ...

in September 1255 and sending troops to the Guelph faction until 1257. He was also able to occupy the Austrian enclave of

Pordenone Pordenone (; Venetian language, Venetian and ) is a city and (municipality) in the Italy, Italian region of Friuli-Venezia Giulia, the capital of the Province of Pordenone, Regional decentralization entity of Pordenone. The name comes from Lati ...

in 1262. Once the Ghibelline menace of Ezzelino had disappeared, he attacked Ulrich III of Carinthia and

Albert I of Gorizia Albert I ( – 1 April 1304), a member of the House of Gorizia (''Meinhardiner'' dynasty), ruled the counties of Gorizia (''Görz'') and Tyrol from 1258, jointly with his elder brother Meinhard IV. In 1271, the brothers divided their heritage ...

. He was however captured by the latter at Villanova dello Judrio of 20 July 1267, being freed only after he promised to sign a treaty of peace (1269). Nevertheless, Gregorio resumed the military operations, but died before he could launch another attack. Previously, Gregorio had signed a treaty with the

Republic of Venice The Republic of Venice, officially the Most Serene Republic of Venice and traditionally known as La Serenissima, was a sovereign state and Maritime republics, maritime republic with its capital in Venice. Founded, according to tradition, in 697 ...

which set the respective areas of influence in the contented Istrian region.

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