James (son of Alphaeus)
James (Son of Alphaeus) was one of the Twelve Apostles of Jesus.
He has traditionally been identified with James the Just, bishop of Jerusalem.
Relation to Matthew
Matthew/Levi is also called son of Alphaeus in the Gospel of Mark 2:14 so tradition has them as brothers but the New Testament does not state this, unlike the sons of Zebedee, Saint James and John.