Liberation Tabernacle Ministries Present - Is St Paul Disciple or Deceiver?

 This is a class that was done byDr. Malachi Z. York. Paul wanted to abandon the commandments of Moses governing the laws of food and sacrificing of animals, as well as the laws of circumcision. In view of this, the differences between Barnabas and Paul grew (Acts 15:2).Barnabas and Paul never stayed very long in one place. What Barnabas wanted was to teach the teachings of Jesus with the new doctrine Paul was developing. At this point (in 49 A.D.) they fell apart.

It is said that it was because Paul wanted John Mark (Barnabas? nephew) along on future missions, then the split occurred. We know that there was more to it than that (Acts 15:39-40). So Barnabas and Mark went to Cyprus, Barnabas? birthplace. 
Ques: So who was John Mark and what part did he play?
Ans: John Mark was an Israelite from Jerusalem. His mother was a supporter of Jesus?