John IV Doukas Laskaris was emperor of Nicaea from August 16, 1258, to December 25, 1261. This empire was one of the Greek states formed from the remaining fragments of the Byzantine Empire, after the capture of Constantinople by Roman Catholics during the Fourth Crusade in 1204.
Baldwin II, also known as Baldwin of Courtenay, was the last Latin Emperor ruling from Constantinople.
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 of the Latin Empire was planned by Venice, which promoted the creation of this state for their self-benefit.
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 medieval period. 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 Principality of Achaea or Principality of Morea was one of the vassal states of the Latin Empire, which replaced the Byzantine Empire after the capture of Constantinople during the Fourth Crusade. It became a vassal of the Kingdom of Thessalonica, along with the Duchy of Athens, until Thessalonica was captured by Theodore, the despot of Epirus, in 1224. After this, Achaea became the dominant power in Greece, lasting continuously for 227 years and cumulatively for 229.
Charles of Valois, the fourth son of King Philip III of France and Isabella of Aragon, was a member of the House of Capet and founder of the House of Valois, whose rule over France would start in 1328.
Philip I of Taranto, of the Angevin house, was titular Latin Emperor of Constantinople by right of his wife Catherine of Valois–Courtenay, Despot of Romania, King of Albania, Prince of Achaea and Taranto.
The King of Thessalonica was the ruler of the Kingdom of Thessalonica, one of the crusader states founded in Greece in the aftermath of the Fourth Crusade (1202–1204). The King of Thessalonica was not an independent ruler; the Kingdom of Thessalonica was one of several vassal states created by the crusaders, subservient to the new Latin Empire of Constantinople, which had supplanted the Byzantine Empire.
Philip, also Philip of Courtenay, held the title of Latin Emperor of Constantinople from 1273–1283, although Constantinople had been reinstated since 1261 to the Byzantine Empire; he lived in exile and only held authority over Crusader States in Greece. He was born in Constantinople, the son of Baldwin II of Constantinople and Marie of Brienne.
Robert II of Taranto, of the Angevin family, Prince of Taranto (1331–1346), King of Albania (1331–1332), Prince of Achaea (1332–1346), and titular Latin Emperor.
Catherine II, also Catherine of Valois or Catherine of Taranto, was the recognised Latin Empress of Constantinople from 1307–1346, although she lived in exile and only had authority over Crusader States in Greece. She was Queen consort of Albania. As well as Princess consort of Achaea and Taranto, and also regent of Achaea from 1332–1341, and Governor of Cephalonia from 1341–1346.
Catherine I, also Catherine of Courtenay, was the recognised Latin Empress of Constantinople from 1283 to 1307, although she lived in exile and only held authority over Crusader States in Greece. In 1301, she became the second wife of Charles of Valois, by whom she had one son and three daughters; the eldest of these, Catherine II of Valois, Princess of Achaea succeeded her as titular empress.
The Treaty of Viterbo was a pair of agreements made by Charles I of Sicily with Baldwin II of Constantinople and William II Villehardouin, Prince of Achaea, on 24 and 27 May 1267, which transferred much of the rights to the defunct Latin Empire from Baldwin to Charles.
The Treaty of Orvieto was an agreement made in 1281 between Charles I of Sicily, Giovanni Dandolo, Doge of Venice, and Philip of Courtenay, titular Latin Emperor, for recovery of the Latin Empire, with the blessing of the Papacy. Intended to restore Latin domination, both civil and ecclesiastical, to Greece, it was forestalled by the War of the Sicilian Vespers, which diverted the resources of Charles to the recovery of Sicily.
Marie of Brienne was Latin Empress as the wife of Baldwin II of Courtenay. She served as regent during the absence of Baldwin II twice: in 1237–1239, and in 1243–1257.
Marie of Bourbon was the sovereign baroness of Vostitsa in 1359-1370. She was princess consort of Achaea and titular Latin empress consort by marriage to Robert of Taranto, Prince of Achaea and titular Latin Emperor of Constantinople. Upon the death of Robert in 1364, she became princess regnant of Achaea until her death.
The Capetian House of Courtenay, also known simply as the House of Courtenay, was a royal house and cadet branch of the Capetian dynasty. Founded by Peter I of Courtenay, a son of King Louis VI of France, the family drew its name from the lordship of Courtenay, to which Peter's wife was heiress.
Philippe de Toucy was a French Crusader nobleman and Bailli of the Latin Empire.
