After imperial Russia annexed Georgia (eastern part in 1801, and western part in 1810), the ancient Georgian Orthodox Church (autocephalous since 750, whose head was since 1008 styled Catholicos-Patriarchs) was reorganized into "Georgian Exarchate," and the newly appointed "Exarch of Georgia" (since 1817 always an ethnic Russian) sat in the Russian Holy Synod at St. Petersburg. Since the entire region of Caucasus fell under the Russian rule, jurisdiction of "Georgian Exarchate" was expanded, encompassing territories of modern-day Georgia, Armenia and Azerbaijan. On 7 April 1917, the Georgian Patriarchate was restored for the Archbishops of Mtsheta and Tbilisi, with the style Catholicos-Patriarch of All Georgia, and the title "Exarch of Georgia" was extinguished, but only for the Georgian part of the Exarchate. The Russian Orthodox Church and its exarch Platon (Rozhdestvensky) kept their jurisdiction over non-Georgian parts of the Caucasian region, and for those territories "Caucasian Exarchate" of the Russian Orthodox Church was created in the summer of 1917, with metropolitan Platon as "Exarch of Caucasus". In the spring of 1918, he was succeeded by metropolitan Cyril (Smirnov) as new "Exarch of Caucasus", but after his transfer to another post in the spring of 1920 no new exarch was appointed.