And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John as their helper.
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Pseudo-Dionysius the Areopagite
AD 550
There is, besides, another John mentioned in the Acts of the Apostles, with the surname Mark, whom Barnabas and Paul attached to themselves as companion, and of whom again it is said: "And they had also John to their minister."