French aristocrat, born in Brienne (Champagne) towards 1304 and died at the battle of Poitiers in 1356. He/She tried unsuccessfully to recover the Duchy of Athens, it governed despoticamnte in Florence, which was ejected and died fighting against the English as Constable of France.
He was the son of Walter V of Brienne, count of Lecce, Lord of Thebes and Duke of Athens and his wife, Giovanna de Châtillon, daughter of the Constable of France. On the death of his father in 1311 he/she inherited all their possessions except for the Duchy of Athens, which was submitted to the King of Sicily. He/She was educated at the Court of Naples and was his tutor his grandfather Gualterio de Châtillon. In 1321 he/she married Beatrice, daughter of Prince Felipe of Taranto and niece of King Robert of Naples. This marriage justified Naples future claims on the Duchy of Athens, of which Walter was herdero, but that his father had lost against the Catalans. At the same time, the Guelphs of Florence asked the help of Robert of Naples and this appointed his son, Carlos of Calabria, as Lord of Florence for a period of ten years (1326-1336). In may 1326, Walter, who had won a notable influence in the Angevin court, was sent to Florence as Vicar of Carlos of Calabria, who retained only a few months.
During the following years, Walter of Brienne prepared their claims to the Catalans of the Duchy of Athens, and in 1331 initiated an expedition to recover, but failed, after passing in the service of the King of France.
In 1340 the factions of Florence returned to ask for the mercy of the King of Naples and in 1342 this sent Walter of Brienne a Florence that was in a total State of anarchy. With the support of the noble class was proclaimed dictator for life, but his despotic government caused the reaction of the Florentines, who stood against him and expelled him a year later. He/She spent several years planning his revenge, which was never carried out. Finally he/she was appointed Constable of France by Juan the good and died fighting against the English at the battle of Poitiers, within the hundred years ' war.
Walter (Walter) of Brienne is the "Duke of Athens" the seventh tale of the second day of the Decameron, one of the nine lovers of the daughter of the Sultan of Babylon. Its mention is probablemante an allusion sarcastic, since his hated dictatorship on Florence took place ten years before Boccaccio wrote the work.
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