According to Romans 16:23, who was host to Paul and to the whole church?

Answer: Gaius

Gaius, who hosted Paul and the whole church, sent greetings, as did Erastus and Quartus; Tertius wrote the letter down.

“I, Tertius, who wrote down this letter, greet you in the Lord. Gaius, who has hosted me and all the church, sends you greetings. Erastus, the city treasurer, sends you greetings, as does our brother Quartus.”— Romans 16:22-23 (BSB)