The evidence of the monuments as to the character and significance of Hekate is almost as full as that of the literature. But it is only in the later period that they come to express her manifold and mystic nature. Before the fifth century there is little doubt that she was usually represented as of single form like any other divinity, and it was thus that the Boeotian poet imagined her, as nothing in his verses contains any allusion to a triple formed goddess. The earliest known monument is a small terracotta found in Athens, with a dedication to Hekate (Plate XXXVIII. a), in writing of the style of the sixth century. The goddess is seated on a throne with a chaplet bound round her head; she is altogether without attributes and character, and the only value of this work, which is evidently of quite a general type and gets a special reference and name merely from the inscription, is that it proves the single shape to be her earlier from, and her recognition at Athens to be earlier than the Persian invasion.
Pausanias stated that Hecate was first depicted in triplicate by the sculptor Alkamenes in the Greek Classical period of the late 5th century. Some classical portrayals, such as the one illustrated below, show her as a triplicate goddess holding a torch. Others continue to depict her in singular form. In Egyptian-inspired Greek esoteric writings connected with Hermes Trismegistus, and in magical papyri of Late Antiquity she is described as having three heads: one dog, one serpent and one horse. Hecate's triplicity is expressed in a more Hellene fashion, with three bodies instead, where she is shown taking part in the battle with the Titans in the vast frieze of the great altar of Pergamum, now in Berlin. In the Argolid, near the shrine of the Dioscuri, the 2nd-ce ...