[2] Though in 1642, he successfully petitioned the King of Spain to exchange his patrimonial titles for a titular honour in the same styling of Prince of Achaea[3] within the Neapolitan nobility.

After a brief tenure as prince, William I received news that his brother Louis in Burgundy had died and decided to return home to France to claim the family lands.

Isabella's eldest daughter, Matilda of Hainaut, may have unsuccessfully attempted to claim the principality in the immediate aftermath of her parents' deposition but was blocked from doing so by the local nobility, who awaited orders from Naples.

To ensure that Isabella and Philip did not attempt to reclaim Achaea, their claims were also purchased and the couple were promised to County of Alba on the shores of the Fucine Lake as compensation.

[18] After she was widowed in 1316, King Robert of Naples ruled that Matilda should marry his younger brother, John of Gravina, as part of a scheme to once more return the principality to the House of Anjou.

The commanders of the Navarrese Company, Mahiot de Coquerel (until 1386) and Peter of San Superano (after 1386) kept up the pretense that they were representatives of the Kings of Naples, the closest and strongest of the possible claimants to the principality, but they were for all intents and purposes rulers of an independent realm.

[41][38] Though he did not use or acknowledge the title, his brother-in-law, John Asen Zaccaria, successfully reclaimed his patrimonial inheritance and achieved international recognition as Prince of Achaea.

[45] It was also Naples and King Ladislaus that had also confirmed Centurione II, father of John, as Prince on 1404 and deprived Maria Zaccaria of her power as reigning princess.

The Popes offered to John -"domino Johanni Zaccarie olim Amoree principi"- a symbolic pension of twenty florins a month.

[50] On 4 November 1642, Philip IV of Spain confirmed through a royal diploma the right of Antonio di Tocco to style himself as the titular Prince of Achaea.

[54] Though in the aforementioned year of 1642, he successfully petitioned the King of Spain to exchange his patrimonial titles for a titular honour in the same styling of Prince of Achaea[55] within the Neapolitan nobility.