"Beloved. (1.) The "chamberlain" of the city of Corinth (Rom." "16:23), and one of Paul's disciples. As treasurer of such a city" "he was a public officer of great dignity, and his conversion to" the gospel was accordingly a proof of the wonderful success of the apostle's labours. "(2.) A companion of Paul at Ephesus, who was sent by him along with Timothy into Macedonia (Acts 19:22). Corinth was his usual place of abode (2 Tim. 4:20); but probably he may have been the same as the preceding.

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Definition of Erastus:
"lovely, amiable"