These legends of the violent ends of the Roman kings suggest that the contest by which they gained the throne may sometimes have been a mortal combat rather than a race. If that were so, the analogy which we have traced between Rome and Nemi would be still closer. At both places the sacred kings, the living representatives of the godhead, would thus be liable to suffer deposition and death at the hand of any resolute man who could prove his divine right to the holy office by the strong arm and the sharp sword. It would not be surprising if among the early Latins the claim to the kingdom should often have been settled by single combat; for down to historical times the Umbrians regularly submitted their private disputes to the ordeal of battle, and he who cut his adversary's throat was thought thereby to have proved the justice of his cause beyond the reach of cavil. XV. The Worship of the Oak THE WORSHIP of the oak tree or of the oak god appears to have been shared by all the branches of the Aryan stock in Europe. Both Greeks and Italians associated the tree with their highest god, Zeus or Jupiter, the divinity of the sky, the rain, and the thunder. Perhaps the oldest and certainly one of the most famous sanctuaries in Greece was that of Dodona, where Zeus was revered in the oracular oak. The thunder-storms which are said to rage at Dodona more frequently than anywhere else in Europe, would render the spot a fitting home for the god whose voice was heard alike in the rustling of the oak leaves and in the crash of thunder. Perhaps the bronze gongs which kept up a humming in the wind round the sanctuary were meant to mimick the thunder that might so often be heard rolling and rumbling in the coombs of the stern and barren mountains which shut in the gloomy valley. In Boeotia, as we have seen, the sacred marriage of Zeus and Hera, the oak god and the oak goddess, appears to have been celebrated with much pomp by a religious federation of states. And on Mount Lycaeus in Arcadia the character of Zeus as god both of the oak and of the rain comes out clearly in the rain charm practised by the priest of Zeus, who dipped an oak branch in a sacred spring. In his latter capacity Zeus was the god to whom the Greeks regularly prayed for rain. Nothing could be more natural; for often, though not always, he had his seat on the mountains where the clouds gather and the oaks grow. On the Acropolis at Athens there was an image of Earth praying to Zeus for rain. And in time of drought the Athenians themselves prayed, "Rain, rain, O dear Zeus, on the cornland of the Athenians and on the plains."