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By 989, Oleg's great-grandson Vladimir I was ruler of a kingdom that extended to as far south as the Black Sea, the Caucasus Mountains, and the lower reaches of the Volga River. Having decided to establish a state religion, Vladimir carefully considered a number of available faiths and decided upon Greek Orthodoxy, thus allying himself with Constantinople and the West. It is said that Vladimir decided against Islam partly because of his belief that his people could not live under a religion that prohibits hard liquor. Vladimir was succeeded by Yaroslav the Wise, whose reign marked the apogee of Kievan Rus'. Yaroslav codified laws, made shrewd alliances with other states, encouraged the arts, and all the other sorts of things that wise kings do. Unfortunately, he decided in the end to act like Lear, dividing his kingdom among his children and bidding them to cooperate and flourish. Of course, they did nothing of the sort.