noble_family alphonso of brienne
The ___MASK41___ was a medieval county in France centered on Brienne - le - Château . Berengaria of León ( 1204  12 April 1237 ) was the third wife but only empress consort of John of Brienne , Latin Emperor of Constantinople . 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 ___MASK79___ . John , originally destined for an ecclesiastical career , became a knight and owned small estates in ___MASK79___ around 1200 . After the death of his brother , Walter III , he ruled the ___MASK41___ on behalf of his minor nephew Walter IV ( who lived in southern Italy ). 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