Cossack - Russia
The term "Cossacks" is applied to specific militaristic communities of various ethnicities living in the southern steppe regions of Ukraine and Russia.
Although many theories exist on the formation of Cossacks, towards the end of the 14th century two Cossack hosts emerged: one on the lower Dnieper River and the other on the Don River. These were joined by numerous Ruthenian migrants who left the adjacent northern states of Moscow and Lithuania. By the start of the 16th century they swelled into large militant states known as hosts.
The Dnieper Cossacks of Ukraine formed the Zaporozhian Sich. Initially a vassal of Poland-Lithuania, the increasing social and religious pressure from the Commonwealth caused them to proclaim a Cossack Hetmanate, initiating a rebellion under Bohdan Khmelnytsky in the mid-17th century. Afterwards, the Treaty of Pereyaslavl with Russia signalled the start of the Commonwealth's decline but also brought Ukraine under Russian control for the next three hundred years.
The Don Cossack Host, allied with the Tsardom of Russia, began a systematic conquest and colonization of lands to secure her borders on the Volga, the whole of Siberia, the Yaik and the Terek Rivers.
This is Ivan Kazansky, AKA Kazanak - another ancestor of Alexei's. There are a few other deviations of him, but they were submitted a very long time ago.