Portal:Catholic Church/Selected anniversaries/May 15
- 913 - Death of Hatto I, Archbishop of Mainz.
- 1252 - Pope Innocent IV issues the papal bull ad exstirpanda, which authorizes the torture of heretics in the Medieval Inquisition.
- 1608 - Birth of René Goupil.
- 1699 - Death of Edward Petre.
- 1773 - Death of Alban Butler.
- 1891 - Rerum Novarum, the first document of the Catholic Social Teaching tradition is published by Pope Leo XIII.