Jamieson, Fausset & Brown

Gaius mine host, and--the host of the whole church--(See Act 20:4). It would appear that he was one of only two persons whom Paul baptized with his own hand (compare Jo3 1:1). His Christian hospitality appears to have been something uncommon. Erastus the chamberlain--"treasurer." of the city--doubtless of Corinth. (See Act 19:22; Ti2 4:20). and Quartus a brother--rather, "the" or "our brother"; as Sosthenes and Timothy are called (Co1 1:1; Co2 1:1, Greek). Nothing more is known of this Quartus.