Mariano Arciero was an 18th-century Italian priest who served as a pastor and theologian in Naples. Born in Contursi Terme, he was recognized as the "Apostle of Calabria" because of his intense dedication to evangelization and teaching catechism to children. He lived a frugal life, focusing on Eucharistic contemplation and charitable works, including visiting hospitals to support his community. After his death in Naples, his remains were eventually returned to his birthplace, where they were inspected for relics in 2012.