Cross reference
Romans 16:23
23 Gaius, my host and host of the whole assembly, greets you. Erastus, the treasurer of the city, greets you, as does Quartus, the brother.
Acts 19:22
22 Having sent into Macedonia two of those who ministered to him, Timothy and Erastus, he himself stayed in Asia for a while.
1 Corinthians 1:14
14 I thank God that I baptized none of you, except Crispus and Gaius,
2 Timothy 4:20
20 Erastus remained at Corinth, but I left Trophimus at Miletus sick.
3 John 1:1-6
1 The elder to Gaius the beloved, whom I love in truth.
2 Beloved, I pray that you may prosper in all things and be healthy, even as your soul prospers.
3 For I rejoiced greatly, when brothers came and testified about your truth, even as you walk in truth.
4 I have no greater joy than this, to hear about my children walking in truth.
5 Beloved, you do a faithful work in whatever you accomplish for those who are brothers and strangers.
6 They have testified about your love before the assembly. You will do well to send them forward on their journey in a manner worthy of God,
Acts 19:29
29 The whole city was filled with confusion, and they rushed with one accord into the theater, having seized Gaius and Aristarchus, men of Macedonia, Paul's companions in travel.
Acts 20:4
4 These accompanied him as far as Asia: Sopater of Beroea; Aristarchus and Secundus of the Thessalonians; Gaius of Derbe; Timothy; and Tychicus and Trophimus of Asia.