Callixtus I was the bishop of Rome, serving as pope from approximately 218 until his death around 222 or 223. During his leadership, he managed the Church's first land property, the cemetery on the Appian Way. He is noted for his policy of admitting converts from various schisms and for establishing practices regarding the absolution of sins. His tenure coincided with the reigns of emperors Elagabalus and Alexander Severus, a period marked by significant doctrinal developments within the early Christian community.