Henry IV of Castile

Henry IV of Castile, nicknamed the Impotent (ruled 1454-1474), was not a strong king. During Henry's reign the nobles increased in power and the nation became less centralised. Due to his nickname, when he died a succession war broke out between his daughter(?) Joanna, who was supported by Portugal, and the eventual winner, his half sister Isabella of Castile, who had the support of Aragon via her husband Ferdinand and later in the war France.