St. Simon is mentioned only once in the Bible in Matthew 13:55

13:55 - Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas?

In the picture St. Simon is spending time with St. Jude. But, neither were saints then.

St. Simon had two additional names Simon the Cananaen and Simon Zelotes both mean "the Zealous." He was not a member of the political party known as the Zealots.

St. Mark mentions Simon as "a brethren of the Lord" (6:3). He was Jesus first cousin. Jesus' surrogate father, Joseph was Simon's uncle and his mother the Virgin's sister. Now, that is new to me, because, in the writings of James the Lesser, Mary was the only child of her parents.

 James the Lesser, a full brother to Joseph, Simon and Jude. It is believed they were the sons of Mary Cleophas the sister of St. Joseph (Christ's foster father). Of the four brothers, three became apostles.

James the Lesser was the Bishop of Jerusalem where all the meetings took place about the circumcision problem. James would be massacred and replaced by Simon. Better to keep it in the family.

Now according to some, the community in Jerusalem was provided a divine message to leave the city. Simon would move to Pella to continue as Bishop. 

Simon is considered to have been about eight years older than Jesus.

Eastern tradition states it is believed St. Simon died of a full age after preaching and teaching in Edessa. It is Western tradition that places him in Egypt with St. Jude and the two martyred.