Along with Ruthenians, these people would have been elevated to create a commonwealth of three nations in the unsuccessful Treaty of Hadiach (-5[2])(“HAHD-yutch”). A group of these people legendarily referred to Sultan Mehmed IV as “an attendant (10[1])of Lucifer” in an insulting letter known as their “reply.” An ataman (10[1])of these people sacked Kazan (10[1])during a rebellion that occurred during Catherine the Great’s reign. Yemelyan Pugachev (10[1])(“ye-MEAL-yan POO-ga-chev”) and Ivan Mazepa were leaders of these people, who lived in groups called hosts and chiefly lived near the Dnieper and Don rivers. For 10 points, name these militaristic, nomadic horsemen that lived (10[1])in Ukraine and Russia. ■END■ (10[2])