It was erected as Diocese of Mohilev in 1772 by the Russian empress Catherine the Great, in a unilateral action independent of Rome. Its territory was split off from the Dioceses of Vilnius (45 parishes including Mohilev), Inflanty and Smolensk. Its effective see was the imperial capital city Saint Petersburg even if an Archbishop's Palace was built in Mohilev.
In 1782 Catherine elevated the diocese to Archdiocese of Mohilev (without suffragan sees), and in 1783 these actions were recognised by Pope Pius VI in the bullOnerosa pastoralis officii.[1]
On 9 August 1798, it lost territory to establish the Diocese of Minsk (in Belarus); the same year it was raised to Metropolitan Archdiocese of Mohilev with five suffragan dioceses. The archdiocese remained the Latin Metropolitan see for Russia throughout imperial times and the Soviet period, although for much of the latter period it was the subject of repression and had no incumbent archbishop.
1841: Ignacy Pawłowski, previously Titular Bishop of Megara (1828.06.23 – 1841.03.01), Auxiliary Bishop of Kamyanets-Podilsky (Ukraine) (1828.06.23 – 1841.03.01)
1849–1851: Kazimierz Dmochowski, previously Auxiliary Bishop of Vilnius (Lithuania) (1840.12.17 – 1848.07.03), Titular Bishop of Meloë in Lycia (1840.12.17 – 1849.07.17), Auxiliary Bishop of Žemaitija (Lithuania) (1848.07.03 – 1849.07.17)
1856–1863: Wacław Żyliński, previously Bishop of Vilnius (Lithuania) (1848.07.03 – 1856.10.27)
1872–1883: Antoni Fijałkowski, previously Titular Bishop of Tanasia & Auxiliary Bishop of Kamyanets-Podilsky (Ukraine) (1858.06.25 – 1860.03.23), succeeding as Bishop of Kamyanets-Podilsky (1860.03.23 – 1872.02.23); also Apostolic Administrator of Minsk (Belarus) (1872.02.23 – 1883.02.11)
1883–1889: Aleksander Gintowt-Dziewałtowski, previously Bishop of Lutsk and Zytomierz (Ukraine) (1883.03.15 – 1891.12.14) and Apostolic Administrator of Kamyanets-Podilsky (Ukraine) (1883.03.15 – 1891.12.14); also Apostolic Administrator of Minsk (Belarus) (1891.12.14 – 1899.11.26)
1891–1899: Szymon Marcin Kozłowski, previously Bishop of Lutsk and Zytomierz (Ukraine) (1883.03.15 – 1891.12.14), Apostolic Administrator of Kamyanets-Podilsky (Ukraine) (1883.03.15 – 1891.12.14); also Apostolic Administrator of Minsk (Belarus) (1891.12.14 – 1899.11.26)
1901–1903: Bolesław Hieronim Kłopotowski, previously Titular Bishop of Eleutheropolis (1897.08.02 – 1899.12.14), Auxiliary Bishop of Lutsk and Zytomierz (Ukraine) (1897.08.02 – 1899.12.14), then Bishop of Lutsk and Zytomierz (Ukraine) (1899.12.14 – 1901.04.15), Apostolic Administrator of Kamyanets-Podilsky (Ukraine) (1899.12.14 – 1901.04.15); also Apostolic Administrator of Minsk (Belarus) (1901.04.15 – 1903.02.24)
1903–1905: Jerzy Józef Szembek, previously Bishop of Płock (Poland) (1901.04.15 – 1903.11.09); also Apostolic Administrator of Minsk (Belarus) (1903.11.09 – 1905.08.07)
1908–1909: Apolinary Wnukowski, previously Bishop of Płock (Poland) (1904.04.01 – 1908.11.29); also Apostolic Administrator of Minsk (Belarus) (1908.11.29 – 1909.06.04)
1917–1926: Eduard von der Ropp, previously Bishop of Tiraspol (Moldova) (1902.06.09 – 1903.11.09), Bishop of Vilnius (Lithuania) (1903.11.09 – 1917.07.25); also Apostolic Administrator of Vilnius (Lithuania) (1917.07.25 – 1918.10.23)
1923.07.05 – 1925.12.14 Jan Feliks Cieplak, as Apostolic Administrator; previously Titular Bishop of Evaria (1908.07.12 – 1919.03.28), Auxiliary Bishop of Mohilev (Belarus) (1908.07.12 – 1925.12.14), Titular Archbishop of Acrida (Epirus) (1919.03.28 – 1925.12.14); later Metropolitan Archbishop of Vilnius (Lithuania) (1925.12.14 – 1926.02.17)