He is the Apostle referred to in the Gospel as "Judas of James",

"Judas not the Iscariot". He also is known as Thaddaeus or Lebbacus. Jude was the brother of James (or the son of James RV), the "brethren of the Lord" - the Lord's relative. Jude is the author of the Epistle of Jude. The Apocryphal "Passion of Simon and Jude" depicted them in Persia where they preached and underwent martyrdom.