In Greek mythology, Opus was a son of Zeus and Protogeneia, the daughter of Deucalion. Opus was a king of the Epeians and father of Cambyse or Protogeneia.
Opus II was a son of Locrus or Zeus by Cambyse and thus a grandson of Opus the first. From him, a portion of the Locri derived their name Opuntii. (see Opus, Locris)
This article incorporates text from a publication now in the public domain: Leonhard Schmitz (1870). "Opus". In Smith, William. Dictionary of Greek and Roman Biography and Mythology 3. p. 40.