[3] Upon his return to Spain he became a member of the cathedral chapter of the canons regular at La Seo where he made his religious profession in 1474.

[3][2] On 14 September 1485 Pedro was attacked in the cathedral as he knelt before the altar and had been wearing armour since he knew his work posed great risks.

[4] As a result, a popular movement against the Jews arose in which nine were executed, two killed themselves, thirteen were burnt in effigy, and four punished for complicity, from 30 June to 15 December 1486, according to the historian Jerónimo Zurita.

Leonardo Sciascia in Morte dell'inquisitore (1964) writes (erroneously) that Arbués along with Juan Lopez de Cisneros (d. 1657)[5] are "the only two cases of inquisitors who died assassinated".

Pope Pius IX said in the document formalizing the canonization (Maiorem caritatem): "The divine wisdom has arranged that in these sad days, when Jews help the enemies of the church with their books and money, this decree of sanctity has been brought to fulfillment".