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In Eastern Christianity, Thaddeus (Jude) the Apostle & Brother of Our Lord, also called Thaddeus, Thaddaeus, Jude or Lebbaeus, was one of the Twelve Apostles of Jesus according to the New Testament
He is sometimes identified with Jude, the brother of Jesus, and was present at Pentecost, when he received the Holy Spirit along with the other apostles.
Here are some ways you can observe this day according to Eastern Christian tradition: