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The Principality of Achaea or Principality of Morea was one of the three 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 for a while the dominant power in Greece.
William of Villehardouin was the fourth prince of Achaea in Frankish Greece, from 1246 to 1278. The younger son of Prince Geoffrey I, he held the Barony of Kalamata in fief during the reign of his elder brother Geoffrey II. William ruled Achaea as regent for his brother during Geoffrey's military campaigns against the Greeks of Nicaea, who were the principal enemies of his overlord, the Latin Emperor of Constantinople Baldwin II. William succeeded his childless brother in the summer of 1246. Conflicts between Nicaea and Epirus enabled him to complete the conquest of the Morea in about three years. He captured Monemvasia and built three new fortresses, forcing two previously autonomous tribes, the Tzakones and Melingoi, into submission. He participated in the unsuccessful Egyptian crusade of Louis IX of France, who rewarded him with the right to issue currency in the style of French royal coins.
During the late Middle Ages, the two cities of Argos and Nauplia formed a lordship within the Frankish-ruled Morea in southern Greece.
Villehardouin was a noble dynasty that originated in Villehardouin, a former commune of the Aube department, now part of Val-d'Auzon, France. It is most notable as the ruling house of the Principality of Achaea, a Frankish crusader state in the Peloponnese peninsula of Greece, between 1209 and 1278, when possession passed to the Angevin Kings of Naples.
Florent of Hainaut was Prince of Achaea from 1289 to his death, in right of his wife, Isabella of Villehardouin. He was the son of John I of Avesnes and Adelaide of Holland. From his father he received the stadholdership (government) of Zeeland.
Guy II de la Roche, also known as Guyot or Guidotto, was the Duke of Athens from 1287, the last duke of his family. He succeeded as a minor on the death of his father, William I, at a time when the duchy of Athens had exceeded the Principality of Achaea in wealth, power, and importance.
Nicholas III of Saint-Omer was one of the most powerful and influential lords of Frankish Greece. He was hereditary Marshal of the Principality of Achaea, lord of one third of Akova and of one half of Thebes. He also served on three occasions as bailli of the Principality of Achaea.
Nicholas II of Saint Omer was the lord of half of Thebes in Frankish Greece from 1258 to his death in 1294. From his two marriages he became one of the richest and most powerful barons of his time, building a splendid castle at Thebes as well as the Old Navarino castle. He also served as bailli of the Principality of Achaea on behalf of the Angevins of Naples between 1287 and 1289.
George I Ghisi was a Latin feudal lord in medieval Greece.
John Chauderon was the Baron of Estamira and Grand Constable of the Principality of Achaea, the strongest of the principalities of Frankish Greece.
John of Saint Omer was baron of a third of Akova and marshal of the Principality of Achaea.
The Barony of Akova was a medieval Frankish fiefdom of the Principality of Achaea, located in the mountains of eastern Elis in the Peloponnese peninsula in Greece, centred on the fortress of Akova or Mattegrifon. It was among the twelve original baronies of Achaea, but was conquered by the Byzantines in 1320.
Guy (II) of Dramelay was the third Baron of Chalandritsa in the Principality of Achaea in Frankish Greece, and also bailli of the Principality in 1282–85.
Richard Orsini was the count palatine of Cephalonia and Zakynthos from before 1260 to his death in 1303/4, and also Count of Gravina in 1284–91. He also served on behalf of the Angevin Kingdom of Naples as captain-general of Corfu in 1286–90 and as the bailli in the Principality of Achaea from 1297 to 1300. He assisted the Despot of Epirus in battle against the Byzantine Empire, and secured the marriage of his son, John I, to the Epirote ruler's daughter, which would lead in 1318 to the Orsini takeover of Epirus.
John I Orsini was the count palatine of Cephalonia and Zakynthos from 1303 or 1304 to his death in 1317. Married to an Epirote princess, John spent a decade at the Epirote court before succeeding his father, Richard Orsini, as count palatine. As a vassal of the Principality of Achaea, he was involved in its domestic affairs and especially the dynastic dispute between the infante Ferdinand of Majorca and Princess Matilda of Hainaut in 1315–16, and participated in a number of Latin campaigns against Epirus, which he aspired to rule. A year after his death, his son and heir Nicholas Orsini seized Epirus and brought it under the Orsini family's rule.
Geoffrey of Briel, in older literature Geoffrey of Bruyères, was a French knight and the third lord of the Barony of Karytaina in the Principality of Achaea, in Frankish Greece. He led a colourful and turbulent life, narrated in detail in the Chronicle of the Morea. Accounted the finest knight in the Principality, he fought in the wars against the Byzantine Greeks, was captured in the Battle of Pelagonia in 1259, and was sent back to Achaea bearing the Byzantine terms in 1261. Geoffrey was twice deprived of his barony, once for rebelling against his uncle, the Prince of Achaea William II of Villehardouin, and then for abandoning the Principality without leave in order to spend time with a mistress, the wife of one of his feudatories, in Italy. He was pardoned both times, but henceforth held his title as a gift of the Prince. He died childless in 1275, and the Barony of Karytaina was split up.
Margaret of Villehardouin was the daughter of William II of Villehardouin, Prince of Achaea, and his third wife Anna Komnene Doukaina.
Nicholas le Maure was a French knight of the Principality of Achaea, lord of Saint-Sauveur, who served as the Principality's bailli on behalf of the Angevins of Naples between 1314 and 1315/6.
The bailli, bailie, or bailiff was the administrative representative of the Princes of Achaea, ruling the Principality of Achaea in the Prince's absence. The early princes, who belonged to the founding Villehardouin dynasty, resided in the principality, and governed it directly. In 1278, Achaea passed to Charles of Anjou, the King of Naples. Charles, and many of his successors, ruled the principality through their baillis, and never visited it in person. Originally, the baillis were Angevin officials, but the post was often given to powerful feudatories from Achaea and the rest of Frankish Greece.
Geoffrey of Aulnay was Baron of Arcadia in the Principality of Achaea in the late 13th century.