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| | CATHOLIC ENCYCLOPEDIA: Castile and Aragon |
 | | 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. |
 | | These topographical conditions made the soil of Aragon very fertile; the mountains are covered with great forests, and fruits grow abundantly, but, on account of the isolation of the mountains and the scarcity of water on some of the high table-lands, some regions are but thinly populated. |
 | | The Compromiso de Caspe placed the crown of Aragon on the head of an Infante of Castile, Ferdinand of Antequera (1412), and the marriage of Isabella, heiress of Henry IV of Castile, to Ferdinand, the heir of John II of Aragon, finally united these kingdoms and formed the beginning of the Spanish monarchy. |
| www.newadvent.org /cathen/03410b.htm (3092 words) |
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