from
Easton's 1897 Bible Dictionary
Justus
(1.) Another name for Joseph, surnamed Barsabas. He and Matthias
are mentioned only in Acts 1:23. "They must have been among the
earliest disciples of Jesus, and must have been faithful to the
end; they must have been well known and esteemed among the
brethren. What became of them afterwards, and what work they
did, are entirely unknown" (Lindsay's Acts of the Apostles).
(2.) A Jewish proselyte at Corinth, in whose house, next door
to the synagogue, Paul held meetings and preached after he left
the synagogue (Acts 18:7).
(3.) A Jewish Christian, called Jesus, Paul's only
fellow-labourer at Rome, where he wrote his Epistle to the
Colossians (Col. 4:11).