Dominguito is the protagonist in one of the first blood libel in the history of Spain – stories that grew in prominence in the 12th and 13th centuries of the Middle Ages, and contributed to antisemitic incidents.

According to the accounts, Alfonso X of Castile wrote the original rendition of the story in 1250, saying: "We have heard it said that some very cruel Jews, in memory of the Passion of Our Lord on Good Friday, kidnapped a Christian boy and crucified him.

"[citation needed] According to the legend, Dominguito was born on 1243 in Zaragoza and was admitted as a cathedral altar-boy and chorister at La Seo because of his beautiful voice.

[1] The story goes that one day on his way home the boy met a Jew by the name of Albayuceto, who deceived him and brought him to a house in the Jewish quarter, where he was nailed to a cross and tortured until he died.

[citation needed] The child's bones were later interred in the cathedral, where in the chapel of Santo Dominguito del Val they are still revered as holy relics.