structural:expansion
Tsardom of Russia

In development of the Third Rome ideas, the Grand Duke Ivan IV (the "Awesome" or "the Terrible") was officially crowned the first Tsar (" Caesar ") of Russia in 1547. The Tsar promulgated a new code of laws (Sudebnik of 1550), established the first Russian feudal representative body (Zemsky Sobor) and introduced local self-management into the rural regions. During his long reign, Ivan IV nearly doubled the already large Russian territory by annexing the three Tatar khanates (parts of disintegrated Golden Horde): Kazan and Astrakhan along the Volga River, and Sibirean Khanate in South Western Siberia. Thus by the end of the 16th century Russia was transformed into a multiethnic, multiconfessional and transcontinental state.

Russia experienced territorial growth through the 17th century, which was the age of Cossacks. Cossacks were warriors organized into military communities, resembling pirates and pioneers of the New World. The native land of the Cossacks is defined by a line of Russian/Ruthenian town-fortresses located on the border with the steppe and stretching from the middle Volga to Ryazan and Tula, then breaking abruptly to the south and extending to the Dnieper via Pereyaslavl. This area was settled by a population of free people practicing various trades and crafts.