Caius was the bishop of Rome from 283 until his death in 296. A native of Salona in Dalmatia, he is believed to have belonged to a noble family connected to Emperor Diocletian. During his leadership, he organized the Roman districts among deacons and established a mandatory progression of clerical orders for those seeking the episcopacy. While historical records regarding his life are limited, he is traditionally remembered for his role in the early Christian community in Rome and his association with the martyrs Susanna and Tiburtius.