the son of Somnus, and brother of Morpheus, was believed to shape the dreams which came to man, whence he derived his name. The gods, says Ovid (Ov. Met. 11.640), called him Icelus, but men called him Phobetor.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890