摘要
At the beginning of the fourteenth century a new feudal estate was created in the northern borderland between the kingdoms of Castile and Aragon, that belonged to one of the most influential members of the royal family at that moment, the infant Peter, a brother of king Ferdinand IV. Because of its vast surface and its strategical position this feudal estate offers a very original profile, that justifies its study. And it also had a very interesting evolution after the sudden death of its lord, the infant Peter, because his widow, a daughter of the king of Arag車n, had to assume the government of the estate, as guardian of their only daughter, Blanca, for, as a consequence of the strategical position of the estate near the border with Aragon, the issue of its government became a central factor for the evolution of the diplomatic relationships between the kingdoms of Castile and Aragon En los primeros a os del siglo XIV se constituy車 en el sector septentrional de la frontera de Castilla con la Corona de Arag車n un extenso estado se orial en manos de unos de los m芍s influyentes miembros de la familia real castellana del momento, el infante Pedro, hermano del rey Fernando IV. Por su extensi車n y situaci車n estrat谷gica dicho estado se orial presenta una notable originalidad, que justifica su estudio. Pero adem芍s tuvo una singular trayectoria tras la prematura muerte de su titular, al quedar bajo el control de su viuda, una hija del rey de Arag車n, como tutora de la 迆nica hija habida del matrimonio, do a Blanca, pues, dada la situaci車n estrat谷gica del se or赤o en la frontera con Arag車n, el gobierno del mismo se convirti車 en asunto central de las relaciones diplom芍ticas entre las monarqu赤a castellana y aragonesa.