In the beginning of the 19th century, while the Russians and Ottomans were vying for control of the region, the rulers of Abkhazia shifted back and forth across the religious divide. The first attempt to enter into relations with Russia was made by Keilash Bey in 1803, shortly after the incorporation of eastern Georgia into the expanding Tsarist empire (1801). However, the pro-Ottoman orientation prevailed for a short time after his assassination by his son Aslan-Bey on 2 May 1808. On 2 July 1810, the Russian Marines stormed Sukhum-Kale and had Aslan-Bey replaced with his rival brother, Sefer-Bey (1810–1821), who had converted to Christianity and assumed the name of George. Abkhazia joined the Russian Empire as an autonomous principality, in 1810. However, George's rule was limited and many mountain regions were as independent as before. The next Russo-Turkish war strongly enhanced the Russian positions, leading to a further split in the Abkhaz elite, mainly along religious divisions. During the Crimean War (1853–1856), Russian forces had to evacuate Abkhazia and Prince Michael (1822–1864) seemingly switched to the Ottomans.