James the Less is a figure of early Christianity, one of the Twelve chosen by Jesus. He is also called "the Minor", "the Little", "the Lesser", or "the Younger", according to translation. He is not to be confused with James, son of Zebedee. He is identified by some as James, the Lord's brother, thought of by St. Jerome and those who followed him as really the cousin of Jesus.
Thomas the Apostle, also called Didymus was one of the Twelve Apostles of Jesus according to the New Testament. Thomas is commonly known as "Doubting Thomas" because he doubted Jesus' resurrection when first told of it; later, he confessed his faith, "My Lord and my God," on seeing Jesus' and placing his fingers in the nail holes and Jesus' side.
Jude was one of the Twelve Apostles of Jesus according to the New Testament. He is generally identified with Thaddeus, and is also variously called Jude of James, Jude Thaddaeus, Judas Thaddaeus or Lebbaeus. He is sometimes identified with Jude, the brother of Jesus, but is clearly distinguished from Judas Iscariot, the apostle who betrayed Jesus prior to his crucifixion.