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| | Fernando I |
 | | On the death of Pedro of Castile in 1369, Ferdinand, as great-grandson of Sancho IV by the female line, laid claim to the vacant throne, for which the kings of Aragon and Navarre, and afterwards John of Gaunt, the Duke of Lancaster (married in 1370 to Constance, the eldest daughter of Pedro), also became competitors. |
 | | Meanwhile Henry of Trastamara, the brother (illegitimate) and conqueror of Pedro, had assumed the crown and taken the field. |
 | | This strange conduct, although it raised a serious insurrection in Portugal, did not at once result in a war with Henry; but the outward concord was soon disturbed by the intrigues of the Duke of Lancaster, who prevailed on Ferdinand to enter into a secret treaty for the expulsion of Henry from his throne. |
| www.nndb.com /people/580/000095295 (338 words) |
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