Quartus

QUARTUS (kwôr'tŭs, Gr. Kouartos). A Christian man of Corinth whose greetings Paul sent to the church at Rome together with those of Gaius and Erastus (Rom.16.23). No doubt he was a friend and assistant of Paul and a worker in the Corinthian church. There is an old tradition that he was originally one of the seventy disciples or missionaries Jesus sent out in Palestine (Luke.10.1).

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QUARTUS kwor’ təs (Gr. Κούαρτος, G3181), a man mentioned in Romans 16:23 as an associate of Paul, who wished to send a greeting to the Christians in Rome. The name is Lat. and appears in its Gr. form in the non-canonical subscription to the TR VS of 1 Corinthians. No other mention in the Scripture, nor any other in the patristic annals has been attested.

International Standard Bible Encyclopedia (1915)

A Christian in Corinth who with "Erastus the treasurer of the city" sent greetings to the Christian community in Rome (Ro 16:23). He is known to Paul only as a Christian, "the brother."