Ryazan (Рязань, rjɪˈzanj) is the largest city and administrative center of Ryazan Oblast, Russia. The city is located on the banks of the Oka River in Central Russia, southeast of Moscow. As of the 2010 Census, Ryazan had a population of 524,927, making it the 33rd most populated city in Russia, and the fourth most populated in Central Russia after Moscow, Voronezh, and Yaroslavl. An older city, now known as Old Ryazan (Staraya Ryazan), was located east of modern-day Ryazan during the late Middle Ages, and served as capital of the Principality of Ryazan up until the Mongol invasion in 1237. During the Siege of Ryazan, it became one of the first cities in Russia to be besieged and completely razed to the ground. The capital was subsequently moved to Peryslavl-Ryazansky (Переяславль-Рязанский), and later renamed to Ryazan by order of Catherine the Great in 1778. The city is known for the Ryazan Kremlin, a historic museum; the Pozhalostin Museum, one of the oldest art museums in Russia; the Memorial Museum-Estate of Academician I.P. Pavlov; and the Ryazan Museum of Long-Range Aviation. In 2022, the Ministry of Construction published an updated rating of the new urban digitalization index. Ryazan entered the top three cities with a population of 250 thousand to a million people. Principality of Ryazan The area of Ryazan was settled by Slavic tribes around the 6th century. It is argued that the Ryazan kremlin was founded in 800, by Slavic settlers, as a part of their drive into territory previously populated by Volga Finnic peoples. Initially, it was built of wood, gradually replaced by masonry. The oldest preserved part of the Kremlin dates back to the 12th century. However, the first written mention of the city, under the name of Pereslavl, dates to 1095. At that time, the city was part of the independent Principality of Ryazan, which had existed since 1078 and which was centered on the old city of Ryazan. The first ruler of Ryazan was supposedly Yaroslav Sviatoslavich, Prince of Ryazan and Murom (cities of Kievan Rus').