Alphonso of Brienne or Alphonse I de Brienne, called Alphonse d'Acre (c. 1225 – August 25, 1270) was the son of John of Brienne and Berenguela of Leon, born in Acre. He was the Grand Butler of France in 1258.
By his marriage (bef. 1250) to Marie d'Issoudon (c. 1223-1260) he became Count of Eu. He was also Grand Chamberlain of France, and died in Tunis on the Seventh Crusade. He had two children by Marie.
He was succeeded by his son John I of Brienne, Count of Eu (d. 1294); his daughter, Blanche (d. c. 1328) became Abbess of Maubuisson.
(From Wikipedia, the free encyclopedia)