They appeared as attendants upon Hera, Aphrodite, Apollo, and the Muses. […] By some authorities he is called a son of Apollo and the muse Urania. […] It was in answer to this prayer that the Muses were created. […] The Roman writers seem to have identified these goddesses with the Muses at pleasure. […] The later poets represent Pegasus as being at the service of the Muses.