The Villehardouin family 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.
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 for a while the dominant power in Greece.
Ferdinand of Majorca was an infante of the Kingdom of Majorca; he was born at Perpignan, the third son of King James II. He was Viscount of Aumelas and Lord of Frontignan from 1311 and claimed the title of Prince of Achaea from 1315.
Geoffrey I of Villehardouin was a French knight from the County of Champagne who joined the Fourth Crusade. He participated in the conquest of the Peloponnese and became the second prince of Achaea.
Geoffrey II of Villehardouin was the third prince of Achaea. From his accession to the princely throne, he was a powerful and respected person, and even French knights came to the principality to enter his service. Geoffrey II emerged as the most powerful vassal of the Latin Empire of Constantinople, the person around whom the crusaders' states in modern Greece gradually regrouped themselves. He came to the rescue of the imperial capital three times. As a reward of his services to the Latin Empire, he was granted suzerainty over the island of Euboea by his brother-in-law, Emperor Baldwin II of Constantinople (1228–1261). He was also a humane prince, benevolent and just, solicitous for the condition of the common people.
Louis of Burgundy was a member of the Capetian House of Burgundy who ruled the Principality of Achaea and claimed the defunct Kingdom of Thessalonica.
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.
Philip I, known as Philip of Savoy was the lord of Piedmont from 1282 until his death and prince of Achaea between 1301 and 1307. He was the son of Thomas III of Piedmont and Guyonne de Châlon.
Isabella of Villehardouin was reigning Princess of Achaea from 1289 to 1307. She was the elder daughter of Prince William II of Achaea and of his third wife, Anna Komnene Doukaina, the second daughter of Michael II Komnenos Doukas, the despot of Epiros.
Matilda of Hainaut, also known as Maud and Mahaut, was Princess of Achaea from 1316 to 1321. She was the only child of Isabella of Villehardouin and Florent of Hainaut, co-rulers of Achaea 1289–1297. After Florent's death in 1297, Isabella continued to rule alone until she remarried to Philip of Savoy in 1300. Per arrangements made with King Charles II of Naples, Isabella was not allowed to marry without his consent and after Philip failed to adequately participate in the king's campaigns against Epirus, Charles in 1307 revoked their rights to Achaea. Matilda, just fourteen years old, tried to press her claim as their heir but was refused by the bailiff Nicholas III of Saint Omer, who instead chose to wait for orders from Naples. Shortly thereafter, Charles appointed his favorite son, Philip of Taranto as the new Prince 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.
The Barony of Karytaina or of Skorta was a medieval Frankish fiefdom of the Principality of Achaea, located in the Peloponnese peninsula in Greece, centred on the town of Karytaina in the mountainous region known as Skorta.
The Barony of Arcadia was a medieval Frankish fiefdom of the Principality of Achaea, located on the western coast of the Peloponnese peninsula in Greece, and centred on the town of Arcadia, ancient and modern Kyparissia.
Vilain of Aulnay was a French knight from Aulnay-l'Aître in the Champagne who became marshal of the Latin Empire of Constantinople and first Baron of Arcadia in the Principality of Achaea. In the Greek version of the Chronicle of the Morea, he is attested as Βηλὲς ντὲ Ἀνόε, a form which passed to the other versions of the Chronicle as Anoé, Annoée or Anoée.
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 Battle of Picotin was fought on 22 February 1316 between the Catalan forces of the infante Ferdinand of Majorca, claimant to the Principality of Achaea, and the forces loyal to Princess Matilda of Hainaut, comprising native levies from the barons loyal to the Princess as well as Burgundian knights. The battle ended in a crushing victory for Ferdinand, but he was later engaged and killed by the troops of Matilda's husband, Louis of Burgundy, at the Battle of Manolada.
Renaud of Briel, in older literature Renaud of Bruyères, was a French knight and the first lord of the Barony of Karytaina in the Principality of Achaea, in Frankish Greece.
Erard I of Aulnay was lord of one half of the Barony of Arcadia in the Principality of Achaea.
Geoffrey of Aulnay was Baron of Arcadia in the Principality of Achaea in the late 13th century.
Vilain II of Aulnay was Baron of Arcadia in the Principality of Achaea in the early 14th century.