maintained close ties with Armenia and the Church of Caucasian Albania shared same Christian dogmas with the Armenian Apostolic Church and had a tradition of their Catholicos being ordained through the Patriarch of Armenia. In the 12th century, the Georgian king David the Builder drove the Muslims out from Caucasus and made the Kingdom of Georgia a strong regional power. In 1194–1204 Georgian Queen Tamar's armies crushed new Seljuk Turkish invasions from the south-east and south and launched several successful campaigns into Seljuk Turkish-controlled Southern Armenia. The Georgian Kingdom continued military campaigns in the Caucasus region. As a result of her military campaigns and the temporary fall of the Byzantine Empire in 1204, Georgia became the strongest Christian state in the whole Near East area, encompassing most of the Caucasus stretching from Northern Iran and Northeastern Turkey to the North Caucasus. The Caucasus region was conquered by the Ottomans, Turco-Mongols, local kingdoms and khanates, as well as, once again, Iran. Modern period Up to and including the early 19th century, the Southern Caucasus and southern Dagestan all formed part of the Persian Empire. In 1813 and 1828 by the Treaty of Gulistan and the Treaty of Turkmenchay respectively, the Persians were forced to irrevocably cede the Southern Caucasus and Dagestan to Imperial Russia. In the ensuing years after these gains, the Russians took the remaining part of the Southern Caucasus, comprising western Georgia, through several wars from the Ottoman Empire. In the second half of the 19th century, the Russian Empire also conquered the Northern Caucasus. In the aftermath of the Caucasian Wars, an ethnic cleansing of Circassians was performed by Russia in which the indigenous peoples of this region, mostly Circassians, were expelled from their homeland and forced to move primarily to the Ottoman Empire. Having killed and deported most of Armenians of Western Armenia during the Armenian genocide, the Turks intended to eliminate the Armenian population of Eastern Armenia. During the 1920 Turkish–Armenian War, 60,000 to 98,000 Armenian civilians were estimated to have been killed by the Turkish army. In the 1940s, around 480,000 Chechens and Ingush, 120,000 Karachay–Balkars and Meskhetian Turks, thousands of Kalmyks, and 200,000 Kurds in Nakchivan and Caucasus Germans were deported en masse to Central Asia and Siberia by the Soviet security apparatus. About a quarter of them died. The Southern Caucasus region was unified as a single political entity twice – during the