Poseidon, the Greek god of the sea, earthquakes, and horses, is known to have had numerous children. According to various myths and legends, Poseidon fathered over 50 children. These offspring include both mortal and immortal beings, such as Triton, a merman; Polyphemus, the Cyclops; and Theseus, the legendary king of Athens. The exact number can vary depending on the sources, as different myths and stories attribute different children to Poseidon. His children played significant roles in various Greek myths, often embodying the traits and powers associated with their divine father.