From Citizendium, the Citizens' Compendium
Cerberos : A mythical dog or hound, with either three heads (or fifty heads -- depending on different versions) that lived in Tartaros. The final labor of Heracles was to capture Cerberos and lead him to the world of the living, according to Greek mythology.
This article contains just a definition and optionally other subpages (such as a list of related articles), but no metadata. if you want to expand this into a full article.