Jude, also known as Judas Thaddaeus, Thaddeus, Jude of James, or Lebbaeus, was a disciple of Jesus and martyr from 1st century Galilee. The use of multiple names in the Bible makes it difficult to determine whether they are one person or several. Cross-referencing the four Gospels, most scholars have agreed that the 'Thaddaeus' in Matthew and Mark is the same person as 'Judas' in Luke and John. Matthew also refers to the apostle as 'Lebbaeus' and 'Judas the Zealot' , whereas Luke and the Acts of the Apostles record him as 'Judas, son of James'.

A collection of biographies compiled by Jacobus de Varagine in the 13th-century attempts to clarify the mixture of names used in the Gospels. Judas was sometimes called Judas James, indicating he was the brother of James. The name Thaddeus comes from 'Thadee', meaning 'from Thadea' and 'Deus', meaning 'of God'. 'Lebbaeus' may mean 'worshipper of heart'.

Jude’s life before becoming a disciple is unknown. Over time, theories and ideas suggest he may have been a farmer by trade. Growing up in Galilee, Jude would probably have spoken both Greek and Aramaic, which would have been beneficial when preaching to people of other areas. The 14th-century historian Nicephorus Callistus believed Jude was the bridegroom at the wedding at Cana recorded in the Gospel of John. This was the event that saw Jesus perform his first miracle.

Jude was martyred around 65 AD in Beirut. Beirut was then part of the Roman Province of Syria.

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