Canserbero Porta Hay un Sentimiento muerto en un corazón Cerberus is a mythical monster in Greek legends. Its portrayal often shows it as a multi-headed canine protecting the gates of the underworld. In some myths, Cancerbero has three heads, while in others it can have up to nine separate heads. The word "cancerbero" is additionally used to refer to a ferocious and unyielding guardian.