Abundius the Sacristan was a 6th-century priest who served as a sacristan at the Church of Saint Peter in Rome. Living during a period when Pope Gregory the Great recorded his life, Abundius was recognized for his piety and holy character. His actions and spiritual influence were documented in the *Dialogues* of Gregory, which highlight his role in the early Christian community in Rome. He died around 564 and is commemorated as a saint in the Catholic tradition.