Patrick O'Hely was an Irish Franciscan priest and the underground Bishop of Mayo during the late 16th century. Born in the mid-1540s, he was a highly educated scholar who studied in Rome and Spain before teaching at the Sorbonne in Paris. He returned to Ireland in 1579 to serve the Catholic community during a period of intense religious persecution under Elizabethan rule. Following his arrest in Limerick, he was subjected to severe torture before being executed in Kilmallock, becoming the first Irish bishop to be put to death after the break with Rome.