Charles I of Anjou sibling Alphonse, Count of Poitiers
Attempts to expand
Charles accompanied Philip III as far as Viterbo in March 1271. Here they failed to convince the cardinals to elect a new pope. Charles's brother, Alphonse of Poitiers, fell ill. Charles sent his best doctors to cure him, but Alphonse died. He claimed the major part of Alphonse's inheritance, including the Marquisate of Provence and the County of Poitiers, because he was Alphonse's nearest kin. After Philip III objected, he took the case to the Parlement of Paris. In 1284 the court ruled that appanages escheated to the French crown if their rulers died without descendants.
brother or sister kin