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| | CATHOLIC ENCYCLOPEDIA: Castile and Aragon |
 | | The united kingdom which came into existence by the marriage (1469) of Isabella, heiress of Castile, with Ferdinand the Catholic, King of Aragon. |
 | | Sancho, who inherited the Kingdom of Castile, began encroaching upon the rights of his brothers, but was assassinated at the siege of Zamora, which he was trying to take from his sister Urraca, and was succeeded by Alfonso VI. |
 | | Old Castile is in outline an irregular triangle, the western frontier bordering on the ancient Kingdom of Leon, the south-eastern boundary being the Sierras de Gredos, Guadarrama, and the Moncayo ( Mons Caunus), and the north-eastern, the river Ebro. |
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