Quartus
The name Quartus means “fourth”.
Easton's Bible Dictionary 1897
Fourth, a Corinthian Christian who sent by Paul his salutations to friends at Rome (Rom. 16:23).
Smith's Bible Dictionary 1863
(fourth), a Christian of Corinth, (Romans 16:23) said to have been one of the seventy disciples, and afterward bishop of Berytus. (A.D. about 50.)
International Standard Bible Encyclopedia 1915
kwor'-tus (Kouartos): 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."