[2] In 1261 she was sent as a hostage to the Byzantine court of Constantinople, in exchange for the release of Prince William II of Villehardouin and the majority of his nobles, who had been captured at the Battle of Pelagonia in 1259.
1275, during which time Passavant was lost to the Byzantines, and her uncle Walter died (ca.
As Margaret had delayed her arrival, Prince William had already confiscated the Barony of Akova.
Margaret's claims became the subject of a celebrated legal dispute, which was abjudicated in a parliament held at Glarentsa, probably in 1276.
In the event, the parliament found in favour of the Prince, but William nevertheless ceded a third of the barony (eight knight's fiefs) to Margaret and John, while the remainder, along with the fortress of Akova itself, became a fief of William's youngest daughter, Margaret.