Alphonso of Brienne

Alphonso of Brienne or Alphonse I de Brienne, called Alphonse d'Acre (c. 1228 – August 25, 1270) was the son of John of Brienne and Berengaria of León, born in Acre. He was the Grand Butler of France in 1258.

By his marriage (bef. 1250) to Marie, Countess of Eu he became Count of Eu. He was also Grand Chamberlain of France, and died in Tunis on the Seventh Crusade. He had at least two children by Marie:
 * John I of Brienne, Count of Eu
 * Blanche (d. bef. 1338), Abbess of Maubuisson

Alphonso’s possible children:
 * Isabella
 * Margaret
 * Guy