query: noble_family alphonso of brienne
supports: The County of Brienne was a medieval county in France centered on Brienne-le-Château. John of Brienne (1170  27 March 1237), also known as John I, was King of Jerusalem from 1210 to 1225 and Latin Emperor of Constantinople from 1229 to 1237. He was the youngest son of Erard II of Brienne, a wealthy nobleman in Champagne. John, originally destined for an ecclesiastical career, became a knight and owned small estates in Champagne around 1200. After the death of his brother, Walter III, he ruled the County of Brienne on behalf of his minor nephew Walter IV (who lived in southern Italy). Berengaria of León (1204  12 April 1237) was the third wife but only empress consort of John of Brienne, Latin Emperor of Constantinople. 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
candidates: champagne county of brienne
answer: county of brienne