Titus Justus

Titus Justus (Revised Version; KJV "Justus") was a God-fearer — a Gentile worshipper of the Jewish God who had not converted to Judaism — whose house adjoined the Corinthian synagogue. When the synagogue expelled Paul after his proclamation that Jesus was the Christ, Paul relocated his teaching ministry to the house of Titus Justus (Acts 18:7), where he remained for eighteen months building the Corinthian church. The name suggests Roman citizenship (Titus being a Roman praenomen, Justus a cognomen).

The strategic location of his house — directly adjacent to the synagogue — meant that synagogue attenders could easily observe and access the emerging Christian community. Some scholars have suggested, though without certainty, that he may be identified with the Gaius Paul mentions in Romans 16:23 ("Gaius, who is host to me and to the whole church") or the Titius Justus of some manuscripts, but these identifications remain speculative.