We have already seen that the horse is connected through Ygdrasil with the symbolism of the tree. The horse is also a “tree of death”; thus in the Middle Ages the funeral pyre was called St. Michael’s horse, and the neo-Persian word for coffin means “wooden horse.”[596] The horse has also the rôle of psycho-pompos; he is the steed to conduct the souls to the other world—horsewomen fetch the souls (Valkyries). Neo-Greek songs represent Charon on a horse. These definitions obviously lead to the mother symbolism. The Trojan horse was the only means by which the city could be conquered; because only he who has entered the mother and been reborn is an invincible hero. The Trojan horse is a magic charm, like the “Nodfyr,” which also serves to overcome necessity. The formula evidently reads, “In order to overcome the difficulty, thou must commit incest, and once more be born from thy mother.” It appears that striking a nail into the sacred tree signifies something very similar. The “Stock im Eisen” in Vienna seems to have been such a palladium. Still another symbolic form is to be considered. Occasionally the devil rides upon a three-legged horse. The Goddess of Death, Hel, in time of pestilence, also rides upon a three-legged horse.[597] The gigantic ass, which is three-legged, stands in the heavenly rain lake Vourukasha; his urine purifies the water of the lake, and from his roar all useful animals become pregnant and all harmful animals miscarry. The Triad further points to the phallic significance. The contrasting symbolism of Hel is blended into one conception in the ass of Vourukasha. The libido is fructifying as well as destroying. These definitions, as a whole, plainly reveal the fundamental features. The horse is a libido symbol, partly of phallic, partly of maternal significance, like the tree. It represents the libido in this application, that is, the libido repressed through the incest prohibition. In the Miller drama an Indian approaches the hero, ready to shoot an arrow at him. Chiwantopel, however, with a proud gesture, exposes his breast to the enemy. This idea reminds the author of the scene between Cassius and Brutus in Shakespeare’s “Julius Cæsar.” A misunderstanding has arisen between the two friends, when Brutus reproaches Cassius for withholding from him the money for the legions. Cassius, irritable and angry, breaks out into the complaint: