Fernandine Wars

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The Fernandine Wars (from the Portuguese Guerras Fernandinas) were a series of three conflicts (1369–70, 1372–73, 1381–82) between the Kingdom of Portugal under King Ferdinand I and the Crown of Castile under Kings Henry II and later John I. They were fought over Ferdinand's claim to the Castilian succession after the murder of King Peter of Castile in 1369. After signing the Treaty of Salvaterra there was a period of civil war (April 1383 - August 1385 Crisis) (1383 - 1385 Portuguese interregnum) in Portugal without a ruling king. This was part of the Hundred Years' War.