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- A Christian, Gaius is mentioned in Macedonia as a traveling companion of Paul, along with Aristarchus (Acts 19:29).
- One chapter later, Gaius who has a residence in Derbe is named as one of Paul's seven traveling companions who waited for him at Troas (Acts 20:4).
- Gaius is mentioned as having a residence in Corinth as being one of only a few people there (the others being Crispus and the household of Stephanas) who were baptised by Paul, who founded the Church in that city (1 Corinthians 1:14).
- Gaius is referred to in a final greeting portion of the Epistle to the Romans (Romans 16:23) as Paul's "host" and also host of the whole church, in whatever city Paul is writing from at the time. In all likelihood, this was Corinth.
- Lastly, Gaius of Ephesus to whom the third Epistle of John is addressed (3 John 1). He may be Gaius mentioned in any of the other contexts.
- FORD, DUSTIN (2021). BELOVED GAIUS : hospitality through the lenses of 3 john. [S.l.]: WESTBOW PRESS. ISBN 1-6642-3832-8. OCLC 1263282560.