With the assassination of Sancho IV, Navarre was invaded by his cousins Alfonso VI of Castile and Sancho V Ramirez of Aragon, and the latter made king in 1076, leading to more than half-a-century (1076–1134) of Aragonese control.
He was assassinated in Peñalén, whence his nickname, by a conspiracy headed by his brother Ramón (el Fratricida, the Fratricide) and his sister Ermesinda.
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On 1 February 1095, Count García Ordóñez and his wife, Infanta Urraca Garcés, sister of Sancho IV of Navarre, granted a fuero of privileges to Fresnillo, then a part of their lordship centred on Nájera.