X is for Xanthus
|Henri Regnault[see page for license], via Wikimedia Commons|
When Patroclus, Achilles' comrade in arms, was killed in battle, Achilles blamed Xanthus in grief for not stopping the death. Hera granted Xanthus human speech and he said to Achilles that Patroclus had been killed by a god, and that a god would soon kill Achilles.
The Erinyes (the Furies) then struck the horse dumb.