Year 1211 (MCCXI) was a common year starting on Saturday of the Julian calendar.
Theodore I Laskaris or Lascaris was the first emperor of Nicaea—a successor state of the Byzantine Empire—from 1205 to his death. Although he was born to an obscure aristocratic family, his mother was related to the imperial Komnenos clan. He married Anna, a younger daughter of Emperor Alexios III Angelos in 1200. He received the title of despot before 1203, demonstrating his right to succeed his father-in-law on the throne.
Henry was Latin emperor of Constantinople from 1205 until his death in 1216. He was one of the leaders of the Fourth Crusade in which the Byzantine Empire was conquered and Latin Empire formed.
The Latin Empire, also referred to as the Latin Empire of Constantinople, was a feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine Empire. The Latin Empire was intended to replace the Byzantine Empire as the Western-recognized Roman Empire in the east, with a Catholic emperor enthroned in place of the Eastern Orthodox Roman emperors. The main objective to form a Latin Empire was planned over the course of the Fourth Crusade, promoted by crusade leaders such as Boniface of Montferrat, as well as the Republic of Venice.
The Empire of Nicaea or the Nicene Empire was the largest of the three Byzantine Greek rump states founded by the aristocracy of the Byzantine Empire that fled when Constantinople was occupied by Western European and Venetian armed forces during the Fourth Crusade, a military event known as the Sack of Constantinople. Like the other Byzantine rump states that formed due to the 1204 fracturing of the empire, such as the Empire of Trebizond and the Despotate of Epirus, it was a continuation of the eastern half of the Roman Empire that survived well into the Middle Ages. A fourth state, known in historiography as the Latin Empire, was established by an army of Crusaders and the Republic of Venice after the capture of Constantinople and the surrounding environs.
The Battle of Pelagonia or Battle of Kastoria took place in early summer or autumn 1259, between the Empire of Nicaea and an anti-Nicaean alliance comprising Despotate of Epirus, Kingdom of Sicily and the Principality of Achaea. It was a decisive event in the history of the Eastern Mediterranean, ensuring the eventual reconquest of Constantinople and the end of the Latin Empire in 1261.
The House of Laskaris, Latinized as Lascaris, was a Byzantine Greek noble family which rose to prominence during the late Byzantine period. The members of the family formed the ruling dynasty of the Empire of Nicaea, a Byzantine rump state that existed from the 1204 sack of Constantinople by the Fourth Crusade until the restoration of the Empire under the Palaeologan dynasty in 1261.
Manuel Komnenos Maurozomes was a Byzantine nobleman who in the aftermath of the Fourth Crusade tried to found an independent principality in Phrygia. His daughter, named Dawlat Raziya Khatun, was married to the Seljuk sultan Kaykhusraw I, and he eventually became governor (emir) of part of the region under Seljuk control; he was an influential figure in the Seljuk court until his death.
The Battle of Antioch on the Meander was a military engagement near Antioch-on-the-Meander between the forces of the Empire of Nicaea and the Seljuk Sultanate of Rûm. The Turkish defeat ensured continued Nicaean hegemony of the Aegean coast of Asia Minor. The Seljuk sultan, Kaykhusraw I, was killed on the field of battle. The battle took place near the modern town of Yamalak in Kuyucak district in Aydın Province.
A Byzantine-Mongol Alliance occurred during the end of the 13th and the beginning of the 14th century between the Byzantine Empire and the Mongol Empire. Byzantium attempted to maintain friendly relations with both the Golden Horde and the Ilkhanate realms, and was caught in the middle of growing conflict between the two. The alliance involved numerous exchanges of presents, military collaboration and marital links, but dissolved in the middle of the 14th century.
Theodore Mangaphas or Mankaphas was a Greek nobleman from Philadelphia, who assumed the title of Byzantine emperor twice, first during the reign of Isaac II Angelos, and secondly after the sacking of Constantinople during the Fourth Crusade.
Adramyttium was an ancient city and bishopric in Aeolis, in modern-day Turkey. It was originally located at the head of the Gulf of Adramyttium, at Ören in the Plain of Thebe, 4 kilometres west of the modern town of Burhaniye, but later moved 13 kilometres northeast to its current location and became known as Edremit.
The Battle of Poimanenon or Poemanenum was fought in early 1224 between the forces of the two main successor states of the Byzantine Empire; the Latin Empire and the Byzantine Greek Empire of Nicaea. The opposing forces met at Poimanenon, south of Cyzicus in Mysia, near Lake Kuş.
Andronikos Palaiologos was the son-in-law and heir-apparent of Theodore I Laskaris, Emperor of Nicaea, in the 1210s.
Isaac Laskaris was a brother of Nicaean emperor Theodore I Laskaris, who along with his brother Alexios Laskaris fled to the Latin Empire and unsuccessfully tried to topple Theodore's successor, John III Doukas Vatatzes, in 1224.
Alexios Laskaris was a brother of Nicaean emperor Theodore I Laskaris, who along with his brother Isaac Laskaris fled to the Latin Empire and unsuccessfully tried to topple Theodore's successor, John III Doukas Vatatzes, in 1224.
Uluabat, in the Byzantine period Lopadion, Latinized as Lopadium, is a neighbourhood of the municipality and district of Karacabey, Bursa Province, Turkey. Its population is 478 (2022). It is the site on the ancient town Miletouteichos.
The struggle for Constantinople was a complex series of conflicts following the dissolution of the Byzantine Empire by the Fourth Crusade in 1204, fought between the Latin Empire established by the Crusaders, various Byzantine successor states, and foreign powers such as the Second Bulgarian Empire and Sultanate of Rum, for control of Constantinople and supremacy in the former empire's territory.
The timeline of the Latin Empire is a chronological list of events of the history of the Latin Empire—the crusader state that developed on the ruins of the Byzantine Empire after the Fourth Crusade in the 13th century.
