Placido Riccardi was a 19th-century Italian Benedictine monk belonging to the Cassinese Congregation. Born in Trevi in 1844, he joined the monastery of St. Paul Outside the Walls in 1866 and finished his final profession two years later. After being released from prison in Florence for avoiding military service, he was ordained a priest in 1871. Throughout his religious life, he held several roles, including serving as a novice master, a spiritual director in Perugia, and the rector of the Basilica di Farfa.