Tbilisi (Georgian: თბილისი [tʰb̥ilisi] ( listen)), formerly known as Tiflis, is the capital and the largest city of Georgia, lying on the banks of the Mtkvari River with a population of roughly 1.5 million inhabitants. Founded in the 5th century by the monarch of Georgia's ancient precursor Kingdom of Iberia, Tbilisi has served, with various intervals, as Georgia's capital for more than a thousand years. Under the Russian rule, the city was the seat of the Tsar's viceroy and has served, from 1801 to 1917, as the Imperial capital of the entire Caucasus, including Georgia's current neighbors. Located on the southeastern edge of Europe, Tbilisi's proximity to lucrative east-west trade routes often made the city a point of contention between various rival empires throughout history and the city's location to this day ensures its position as an important transit route for global energy and trade projects. Tbilisi's varied history is reflected in its architecture, which is a mix of medieval, classical, and Soviet structures. Historically, Tbilisi has been home to people of diverse cultural, ethnic, and religious backgrounds, though it is overwhelmingly Eastern Orthodox Christian. Notable tourist destinations include cathedrals like Sameba and Sioni, classical Freedom Square and Rustaveli Avenue, medieval Narikala Fortress, pseudo-Moorish Opera Theater, and the Georgian National Museum.