Sometimes he carries a buckler, and is accompanied by the three Graces, who are the animating deities of genius and the fine arts, and at his feet is placed a swan. […] His feasts were celebrated every three years, and were called orgies, from a word which signifies fury and impetuosity. […] Cerberus, a dog with three heads, watched at the entrance to Tartarus. […] Pluto is generally represented as holding a trident with three prongs, and has a key in his hand, to intimate that whoever enters can never return. […] He was the father of the Oceanides to the number of three thousand.