"Henry IV of Castile (Castilian: Enrique IV) (5 January 1425 – 11 December 1474), King of Castile, nicknamed "the Impotent", was the last of the weak ...
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late medieval kings of Castile. During Henry´s reign, the nobles became more powerful and the nation became less centralised." - (en.wikipedia.org 31.01.2020)