Diego José (baptismal name José Francisco Caamaño y López) was born on March 30, 1743 at Cádiz. In 1759 (at 16), Diego entered the Capuchin Order.
Ordained priest in 1766, Diego undertook the apostolic preaching ministry across Andalusia and Extremadura for the 35 years (1766–1801) — in institutional response to the Enlightenment-era religious skepticism.
Diego became famous during his lifetime as the 'Apostle of Spain' (Apóstol de España) — conducting massive open-air preaching campaigns that drew tens of thousands of listeners. The Diego-of-Cadiz preaching campaigns established the Spanish Catholic revival of the late 18th century.
He died at Ronda on March 24, 1801 at the age of 57.

