Mary, mother of John Mark
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Mary (Hebrew מרים Miryām, Miryam "Bitter") the mother of John, surnamed Mark, was one of the earliest of Jesus' disciples. She was the sister of Barnabas (Colossians 4:10), and joined with him in disposing of their land and giving the proceeds of the sale into the treasury of the early Christian Church (Acts 4:37; 12:12). Her house in Jerusalem was the common meeting-place for the disciples there.
Some have conjectured she is the same Mary mentioned in Romans 16:6.
Initial text from Easton's Bible Dictionary, 1897 -- Please update as needed