He is also called Simon the "Canaanite", which
means zealot.
Those that had been called as disciples were
called just before Passover of 27 AD.
Jesus' miracle of turning water into wine at the
wedding caused him to leave all and to follow Him.
He was one of the original followers of Christ and
was with the other apostles on all occasions.
He was also martyred, his body was
said to have been
sawed to pieces
in about 65 A.D.