"Son of man", "son of Adam", or "as a man", are phrases used in the Hebrew Bible, various apocalyptic works of the intertestamental period, and in the Greek New Testament. In the indefinite form used
"One like a son of man" with a sword among the seven lampstands, in John's vision. From the Bamberg Apocalypse, 11th century.
Christ, by Titian – (detail) 1553, oil on canvas, 68x62cm, Prado Museum Madrid.