Kitto's Popular Cyclopedia of Biblial Literature
Eras´tus, a Corinthian, and one of Paul's disciples, whose salutations he sends from Corinth to the Church at Rome as those of 'the chamberlain of the city' (). The words so rendered denote the city treasurer or steward, an officer of great dignity in ancient times. We find this Erastus with Paul at Ephesus, whence he was sent along with Timothy into Macedonia (). They were both with the Apostle at Corinth when he wrote, as above, from that city to the Romans: at a subsequent period Erastus was still at Corinth (), which would seem to have been the usual place of his abode.
Kitto, John, ed. Entry for 'Erastus'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/e/erastus.html.