In Greek mythology, whose son was the Egyptian king Busiris?

In Greek mythology, Busiris (Ancient Greek: Βούσιρις) was an Egyptian king who was killed by Heracles.

In Isocrates' rhetorical use of a theme that he considers unworthy of serious treatment, the villainous king of Egypt named Busiris, a son of Poseidon and Libya or Lysianassa, was the ancient founder of Egyptian civilization, with an imagined "model constitution" that Isocrates sets up as a parodic contrast to the Republic by Plato. Plutarch says that his mother is Anippe, daughter of the river-god Nilus. The monstrous Busiris sacrificed all visitors to his gods. Heracles defied him, broke his shackles at the last minute and killed Busiris.