Based on the thorought study of the Angevins registers of Naples, this doctoral thesis aims at analysing the caracteristics of the Angevin power established in the principality of Morea, from its transfer by prince William of Villehardouin to the king Charles Ist of Anjou in 1309, until the death of Charles II of Anjou in 1309. Superior lords of the principality during this period, and effective princes of Morea between 1278 and 1289, the kings of Sicily cared about governing this territory, installing an efficient and centralized administration, leaning both on the human resources of their kingdom and on the Moreotes elites, leading their politics in the respect of the local customs. They didn't change the feodal and religious structures of the principality, and they stimulated commercial exchanges with Morea. They imposed their authority to the princes and the princess Isabelle of Villehardouin. The angevins succed in managing several conflicts, even the one between the prince and the duke of Athens. But they couldn't retake the territories capures by the Byzantins : if Charles Ist lead several military operations in the Peloponese without real success, the Sicilian Vespers crisis put an end to his military ambitions. Charles II let the defense of the principality to the prince hands. The principilaty of Morea became dependant on the kingdom of Sicily, especially with the deposition of the princess Isabelle in 1304, and became then a mere peripheral province of the kingdom of Sicily