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In page María de Padilla:

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In the summer of 1353, under coercion from family and the main court favorite, Juan Alfonso de Alburquerque, Peter wed Blanche of Bourbon, the first cousin of King John II of France. Peter abandoned Blanche within three days when he learned that she had an affair with his bastard brother Fadrique Alfonso en route to Spain, and that the dowry was not coming.[citation needed]