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When Milan was the capital of the west, it surpassed Rome in importance because the imperial court was there. Christianity was made the state religion of the empire with the Edict of Milan. Two fathers of the Catholic church worked in Milan.
During Yaroslav's reign the cities of Kyiv, Novgorod the Great, Chernihiv, Pereiaslav, Volodymyr-Volynskyi, and Turiv were considerably transformed. Over 400 churches were built in Kyiv alone, which was turned thereby into an architectural rival of Constantinople. Yaroslav's walled inner city in Kyiv covered an area of nearly 60 ha. It was entered through the Golden Gate, Polish Gate, and Jewish Gate, and the Saint Sophia Cathedral stood in the center, encircled by large palaces.