Some reckon no more than three of them, viz. […] To designate these three qualities or offices, the name of Triformis, and Tergemina, or the goddess with three forms, was given to her. […] By her he had three sons, and two celebrated daughters, Ariadne and Phedra. […] Geryon was a monster, with three bodies and three heads. […] The king himself was a monster with three bodies and three heads, and was guarded by a dog with two heads, and a dragon with seven.