Nathanael, a disciple of Jesus Christ, concerning whom, under that name at least, we learn from Scripture little more than his birthplace, Cana of Galilee, and his simple, truthful character. He is only mentioned six times in Scripture with five of those instances being in John 1:43-51. The only other mention of him is in John 21:2 where it says he went fishing with Peter and saw Jesus in His glorified body.
He was “a genuine son of Israel—a man of complete integrity.” (John 1:47, 48). His name occurs only in the Gospel of John, and his name does not occur in the first three Gospels; but it is commonly believed that Nathanael and Bartholomew are the same person. The evidence for that belief is as follows: John, who twice mentions Nathanael, never introduces the name of Bartholomew at all. Matthew, Mark, and Luke, all speak of Bartholomew but never of Nathanael. It was Philip who first brought Nathanael to Jesus, just as Andrew had brought his brother Simon.
Smith’s Bible Dictionary: Comprising Antiquities, Biography, Geography, Natural History, Archaeology and Literature.