 The city rose to prominence when Siberia was once again reorganized in 1822, Omsk became the administrative center of the General Governorate of Eastern Siberia rising above the old center of Siberia, Tobolsk.The new governorate was divided into oblasts around the cities of Omsk, Petropavlovsk, Semipalatinsk and Ust-Kamenogrsk populated by Russian colonists and okrugs populated by Kazakh nomads.In subsequent reforms the name of the Oblast was changed repeatedly to The Oblast of The Siberian Kyrgyz (1854), Akmolinsk Oblast (1868), and Omsk Oblast (1917) before finally reverting to the Omsk Governorate in 1918.