A.T. Robertson Commentary Romans 16:21

"Timothy my fellow-worker saluteth you; and Lucius and Jason and Sosipater, my kinsmen." — Romans 16:21 (ASV)

Verses 21-23 form a sort of postscript with greetings from Paul's companions in Corinth. Timothy was with Paul in Macedonia (2 Corinthians 1:1) before he came to Corinth. Lucius may be the one mentioned in Ac 13:1. Jason was once Paul's host (Acts 17:5–9) in Thessalonica, Sosipater may be the longer form of Sopater of Ac 20:4. They are all Paul's fellow-countrymen (συγγενεις).