Simon the Zealot

Facts:

Simon the Zealot was one of Jesus' twelve disciples.

Simon is mentioned three times in the listing of Jesus' disciples, but little else is known about him.
Simon was one of the Eleven who met to pray together in Jerusalem after Jesus went back up into heaven.
The term "zealot" may mean that Simon was a member of "the Zealots" which were a Jewish religious party that was very zealous in its support of upholding the Law of Moses while strongly opposing the Roman government.
Or, "zealot" may simply mean, "the zealous one," referring to Simon's religious zeal.

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