23 Greeting you is Gaius, my host, and of the whole ecclesia. Greeting you is Erastus, the administrator of the city, and Quartus, the brother."
Romans 16:23 Cross References - CLV
Acts 19:22
22 Now dispatching to Macedonia two of those serving him, Timothy and Erastus, he attended, for the time, to the province of Asia."
Acts 19:29
29 And filled is the city with confusion. Besides, they rush with one accord into the theater, gripping Gaius and Aristarchus, Macedonians, fellow travelers of Paul."
Acts 20:4
4 Now it was arranged for him to be met, as far away as the province of Asia, by Sopater Pyrrhus, a Berean. Yet of the Thessalonians, Aristarchus and Secundus, and Gaius the Derbian, and Timothy, yet of the province of Asia, Tychicus and Trophimus."
1 Corinthians 1:14
14 I am thanking God that I baptize not one of you except Crispus and Gaius,
2 Timothy 4:20
20 Erastus remains in Corinth, yet Trophimus, being infirm,
3 John 1:1-6
1 The elder, to Gaius, the beloved, whom I am loving in truth:"
2 Beloved, concerning all I am wishing that you be prospering and sound, according as your soul is prospering."
3 For I rejoiced very much at the brethren's coming and testifying to your truth, according as you are walking in truth."
4 I am having no greater joy than this, that I am hearing of my children walking in the truth."
5 Beloved, you are doing a faithful thing whatsoever you should work for the brethren, and this for strangers,
6 who testify to your love in the sight of the ecclesia, to whom you will be doing ideally by sending them forward worthily of God,