Walter William Skeat, Chaucer's Works (ed. Skeat) Vol… (1900)
“ Juno caused Athamas, the husband of Ino, to run mad. As Ovid tells the story, Juno descended into hell, and crossed the Styx, in order to persuade the fury Tisiphone to haunt Athamas. Hence the mention of the Styx was readily suggested. See Ovid, Met. iv. 416-561, esp. l. 434. Styx was not, as Chaucer says, 'the pit of hell,' but a river that flowed through it. ”
