CERBERUS, the offspring of Typhon and Echidna, was the three-headed hound of the underworld. His capture was Hercules's twelfth and most difficult labor (Met VII.409-419).

Cerberus appears in the Monk's Tale of Hercules, MkT 2103, and in Lady Philosophy's rehearsal of the labors, Bo IV, Metr 7.36. Cerberus, the porter of hell, is abashed by Orpheus's song, Bo III, Metr 12.31-33. Pandarus swears by Cerberus in hell that if Troilus loved his sister, he should have her, Tr I.859-861. [Ercules: Orpheus]

Cerberus occurs in medial positions, MkT 2103; Tr I.859, and in the prose of the Boece.