The incarnate god was probably representative of a god or spirit of earth, growth, or vegetation, represented also by a tree. A symbolic branch of such a tree was borne by kings, and perhaps by Druids, who used oak branches in their rites.[528] King and tree would be connected, the king's life being bound up with that of the tree, and perhaps at one time both perished together. But as kings were represented by a substitute, so the sacred tree, regarded as too sacred to be cut down, may also have had its _succedaneum_. The Irish _bile_ or sacred tree, connected with the kings, must not be touched by any impious hand, and it was sacrilege to cut it down.[529] Probably before cutting down the tree a branch or something growing upon it, e.g. mistletoe, had to be cut, or the king's symbolic branch secured before he could be slain. This may explain Pliny's account of the mistletoe rite. The mistletoe or branch was the soul of the tree, and also contained the life of the divine representative. It must be plucked before the tree could be cut down or the victim slain. Hypothetical as this may be, Pliny's account is incomplete, or he is relating something of which all the details were not known to him. The rite must have had some other purpose than that of the magico-medical use of the mistletoe which he describes, and though he says nothing of cutting down the tree or slaying a human victim, it is not unlikely that, as human sacrifice had been prohibited in his time, the oxen which were slain during the rite took the place of the latter. Later romantic tales suggest that, before slaying some personage, the mythico-romantic survivor of a divine priest or king, a branch carried by him had to be captured by his assailant, or plucked from the tree which he defended.[530] These may point to an old belief in tree and king as divine representatives, and to a ritual like that associated with the Priest of Nemi. The divine tree became the mystic tree of Elysium, with gold and silver branches and marvellous fruits. Armed with such a branch, the gift of one of its people, mortals might penetrate unhindered to the divine land. Perhaps they may be regarded as romantic forms of the old divine kings with the branch of the divine tree.