St. Joseph of Palestine.
No, not St. Joseph the Carpenter. No, this is a different guy.
Among the notable Christians of Emperor Constantine’s time was an ex-disciple of Rabbi Hillel II (?). He was named Joseph, and was left the guardianship of Hillel’s son, Judah, after the rabbi died. He was a member of the Sanhedrin and also worked as an envoy for them.
Joseph alleged that in his last days, Hillel sent for a “physician” who was actually the local bishop, and received a “bath for his health” that was actually Baptism. Joseph kept silent about this, but he did get interested in reading the Gospels. At one point, he had a vision of Jesus. So he decided to become a Christian, but hadn’t done anything about it when he was caught with his suspicious Christian books, all the way out in Cilicia, where he was being an envoy. He was saved from being drowned in the river by the public arrival of s Cilician bishop, who took Joseph off to safety.
Emperor Constantine got very interested in the story and made Joseph a high officia in AD 323. During his time in office, he dealt with opposition by both Jews and Arian Christians, as he tried to build a church in his headquarters city, Tiberias. He also built churches in several Galilean towns important to the Gospels, including Sepphoris, Nazareth, and Capernaum. (There’s a lot of question as to whether any Christians lived there, or if he was just trying to create pilgrimage centers, or what. Apparently these were big centers of unrest during the Jewish revolt against Constantius Gallus.)
The good life ended when Emperor Constantine started to favor Arian bishops and persecute orthodox ones. Joseph moved to a nice place in Scythopolis, which had the advantage of being away from both Jewish and Christian factions. He used his place as a safe house for orthodox folks in trouble, including St. Eusebius of Vercelli and St. Epiphanius (who recorded his story in his book on heresies, the Panarion, in Lib. 30, c. 4).
Joseph died in AD 356. His feastday is July 22, and it is on the calendars of both East and West. He’s also known as Joseph of Tiberias.