Confessor Diego

Saint Didacus of Alcalá, known in Spanish as San Diego de Alcalá, was a Franciscan lay brother of the Observant reform who lived in the Crown of Castile during the fifteenth century. He was born in the small mountain town of San Nicolás del Puerto in the Sierra Morena of Andalusia, probably near the beginning of the fifteenth century. From youth he was drawn to a life of solitude and austerity; he spent a period as a hermit before seeking admission to the Franciscans as a lay brother rather than as a candidate for the priesthood. He was assigned the humble offices of porter, cook, and infirmarian in several Andalusian friaries.

In the early 1440s he was among the friars sent to the Canary Islands, then recently brought under Castilian control, where he worked especially on Fuerteventura. Accounts from the period describe him as a man of prayer and charity who assisted in the evangelization of the Guanche people, though he remained a lay brother and never celebrated Mass. After his return to the Iberian Peninsula he lived in various houses of the order, including Seville, before being transferred to the convent of Santa María de Jesús in the university town of Alcalá de Henares. There he continued his hidden life of work and contemplation and became known for caring for the sick during an outbreak of plague.

Didacus died in Alcalá de Henares on 12 November 1463. His body was found incorrupt, and a popular cult arose almost immediately. In 1562 the young Don Carlos, son of King Philip II, suffered a severe head injury in Alcalá; after the relics of Didacus were brought to the prince's bedside, the boy recovered, an event widely publicized and later cited in the canonization process. Pope Sixtus V canonized Didacus on 2 July 1588, the first member of the Franciscan Observance to be so honored after the Council of Trent. His liturgical feast was fixed on 13 November.

The city and diocese of San Diego in California take their name from the mission founded in his honor by Franciscan missionaries in 1769. His incorrupt remains are still venerated in the Cathedral-Magistral of Saints Justus and Pastor in Alcalá de Henares. He is invoked as patron of Franciscan lay brothers and of the city that bears his name.