William was ambitious "and headstrong by nature", but his "political projects, conceived on a grand scale, were apt to fail because he over-estimated his strength and took too many risks". William is the key protagonist of the Chronicle of Morea. Marino Sanudo the Elder emphasizes the prosperity of William's principality, mentioning merchants could travel in Achaea safely, without using cash. He says that William's court "appeared greater than a great king's court". William was noted as a trouvère (composer). Two of his compositions have been preserved in the , a richly illuminated 13th-century collection of ballads and poems. Achaea could never regain its power after the Nicaean victory at Pelagonia. Although the Byzantine governors of the Morea conquered the baronies of Passavant and Kalavryta during the last years of his reign, William kept most lands he had inherited from his brother. After the Treaty of Viterbo, Achaea "passed for the duration of its checkered history into the orbit of Neapolitan politics, warfare, and intrigue". With opening the princely print at Glarentza, William put an end to his principality's dependence on Byzantine coins. The Achaean coins were struck on the patterns of William's coins during the reign of his successor. Family William's first wife, the unnamed daughter of Narjot of Toucy, was King Louis IX's second cousin through her grandmother, Agnes of France. Cheetham writes she died before William inherited Achaea from his brother. Historian Karl Hopf conjectured that Carintana dalle Carceri was William's second wife. As Setton writes, she "comes to life in the pages of Frankish history only on the day she died, for her death caused the war of the Euboeote succession". Setton, among other scholars, endorses Raymond-Joseph Loenertz's refutation of Hopf's conjecture. He writes that Hopf misinterpreted Marino Sanudo's report of her death and its consequences. However, other authors, including Cheetham and Peter Lock, mention her as William's wife. William's next wife, Anna Komnene Doukaina, took the name of Agnes on their marriage. Their elder daughter, Isabella, could not return to Achaea from Naples after the death of her first husband Philip of Anjou. In 1289, Charles I's son and successor, Charles II, restored her right to rule Achaea and married her off to his distant cousin Florent of Hainaut. After Florent died in 1297, she ruled Achaea alone until her third marriage with Philip of Savoy in 1301. The Achaean barons disliked Philip, and Charles II