The writer calls himself Jude. This may not be the same person as Jude the Apostle. This Jude calls himself a brother of James, who was a leader in the church at Jerusalem. Both Jude and James were probably half brothers of Jesus. They did not believe that he was the Christ, until after the Resurrection. (John chapter 7, verse 5) The book may have been written between 60 and 80 A.D. and was sent to many places. This is called a "General" epistle. 