Romans 16:13

alute Rufus the chosen in the Lord, and his mother and mine. [We know nothing certain of these. Paul had evidently spent time in the home of Rufus, and had received motherly care at that time, which he now gracefully acknowledges, reckoning that if the woman of the home was Rufus' mother by nature, she was also is by service and affection (Matthew 19:29). Possibly this Rufus may have been Simon's son (Mark 15:21), and Paul may have lived with them while a youthful student in Jerusalem (Acts 22:3). The tradition that Mark wrote his Gospel while at Rome adds to the plausibility that both he and Paul refer to the same Rufus.]