Labels:bulletin board | concert | door | flower | sky | trade name | tree OCR: Orthodox world that had formed ir Byzantium This often came as the result of collaboi ration be tween Russian and Greek masters and the great number of Byzantine icons sent to Russia at that time The devastation of Consi tantinople by the Crusaders in 1204 and the Mongol- Tartar invasion of Russia led to wide gap emerging in the cultural unity of the Orthodox world However. the forced isolation of Russian art proved to be one of the most important factors influencing the independent evolution of national artistic schools. the second half of the 13th century that such major collaboration Drthodo factor evolutior centur
