Crispus and Gaius were two of Paul's first converts in Corinth. Crispus was once a leader of the synagogue in Corinth (see Acts 18:8). Gaius later let Paul use his home (see Romans 16:23). This might mean he was Titius Justus, an earlier convert to Judaism who lived next to the synagogue (see Acts 18:7). His full Roman name would then be Gaius Titius Justus.