Gaius: 1 Corinthians 1:14; 3 John 1:1-6
Erastus: Acts 19:22; 2 Timothy 4:20
the chamberlain: Or, as the Vulgate renders, arcarius civitatis:, "the treasurer (or steward, οικονομος: strong:G3623,) of the city;" he to whom the receipt and expenditure of the public money were entrusted.