Prior, during the second half of the nineteenth century a large number of pro-Russian Pontic Greeks from the Pontic Alps and the province of Erzerum, resettled in the area around Kars (which together with southern Georgia already had a nucleus of Caucasian Greeks). The mountainous vilayet (province) of Kars was ceded to the Russian Empire following the Russo-Turkish war that culminated in the 1878 Treaty of San Stefano. They had declined the expedient of conversion to Islam, abandoned their lands, and sought refuge in territory now controlled by their Christian Orthodox "protector", which used Pontic Greeks, Georgians, and southern Russians, and even non-Orthodox Armenians, Germans, and Estonians to "Christianize" this recently conquered southern Caucasus region, which it then administered as the newly created Kars Oblast (Kars Province).