Pope Leo xiii

Pope Leo xiii had an encounter with the devil and subsequently wrote the prayer of St Michael which is a prayer against the devil.

"Pope Leo XIII reportedly experienced a vision after Mass in 1884 where he witnessed a conversation between God and Satan. Satan boasted that he could destroy the Church if given 75-100 years and greater power over his followers, which God granted. The vision also revealed to the Pope a glimpse of the events of the 20th century, including wars, immorality, and genocide. In response to this vision, Pope Leo XIII wrote the Prayer to Saint Michael, which is widely used by Catholics." ai source