Read the excerpt from The Myths and Legends of Ancient Greece and Rome by E. M. Berens.At last it was settled by lot that Zeus should reign supreme in Heaven, whilst Aides governed the Lower World, and Poseidon had full command over the Sea, but the supremacy of Zeus was recognized in all three kingdoms, in heaven, on earth (in which of course the sea was included), and under the earth. Zeus held his court on the top of Mount Olympus, whose summit was beyond the clouds; the dominions of Aides were the gloomy unknown regions below the earth; and Poseidon reigned over the sea.