Nicholas II of Saint-Omer

[4]\ In 1287, the Neapolitan regent Robert of Artois named him the Angevins' representative governor (bailli) in the Principality of Achaea,[2][5] in succession of William I of Athens, who had just died and whose heir, Guy II, was still under-age.

[6][7] He continued William's policy of fortification of Messenia and built the castle at Navarino and a smaller fortress at Maniatochori near Modon.

[2][6][9] With financial aid from Mary of Antioch, Nicholas built the Castle of Saint Omer (in Greek Σανταμέρι, Santameri) in the Cadmea, the ancient acropolis of Thebes, which is much praised by the Chronicle of the Morea as being the strongest and most beautiful in Greece.

[8][10] Anna on the other hand, as Princess-dowager, brought with her a considerable property, including the castles of Kalamata and Chlemoutsi, comprising "some of the most fertile lands and the strongest fortress in the Morea", according to A. Bon.

This worried King Charles, who was loath to cede these territories to an already very powerful and wealthy subject; in the event, they were exchanged in September 1281 with half the domains of the recently deceased Leonard of Veroli, comprising estates in both the Morea (in Elis and Messenia) and Italy.