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The earliest reference to Ansur is found in a document dated 4 March 921, wherein he is named with his parents Fernando Ansúrez and Muniadonna in a donation in the vicinity of Burgos to San Pedro de Cardeña.
His name appears for the first time in charter of the Monastery of San Pedro de Cardeña (899), one of the most influential monastic houses later in Castile together with the Monastery of Santo Domingo de Silos.