Of the Russian princes who went to prostrate themselves at the foot of the Great Khan’s throne, none made a more favorable impression upon him than the prince of Moscow, in whose favor the Khan was wont to decide all cases of dispute between the prince and his rivals. When the Mongol power had begun to decline in strength and the princes of Moscow had grown stronger, they ventured, in 1480, to kill the Mongol ambassadors sent to demand tribute, and thus freed themselves from the Mongol yoke. But the Tartar occupation had left its mark, for the princes of Moscow imitated the Khans rather than the western rulers, of whom, in fact, they knew nothing. In 1547 Ivan the Terrible assumed the Asiatic title of Tsar, which appeared to him more worthy than that of king or emperor. The costumes and etiquette of the court were also Asiatic. The Russian armor suggested that of the Chinese, and their headdress was a turban. It was the task of Peter the Great to Europeanize Russia.