James I of Urgell
James I (1321–1347), infante of Aragon and count of Urgell, was born in Zaragoza, a son of King Alfonso IV of Aragon and Teresa d'Entença, countess of Urgell. He inherited the County of Urgell after his father renounced it.
In 1336 he married Cecilia, daughter of Bernard VIII of Comminges; they had a son, Peter, who succeeded him. His brother Peter IV had no son, which made James heir presumptive. When the king tried to put his own daughter in James's place, James fled to Zaragoza and won over nobles eager to reassert their power, and Peter had to restore him as procurator general.
James died suddenly in Barcelona on 15 November 1347, widely believed poisoned on Peter's orders. Without him the Union of Aragon was crushed at Epila in 1348.