the 18th century and is still used in historical contexts. The term remains current in Arabic as an alternative name for Russia. Derived from it is al-Muskubīya (المسكوبية), the Arabic name of the Russian Compound district of Jerusalem, where Czarist Russia established various institutions in the 19th century, and hence also the name of the Al-Moskobiya Detention Centre located there. Ivan III claimed the title of "Sovereign and Grand Duke of all Rus (). By his marriage to Sophia Palaiologina, niece of Constantine XI Palaiologos, the last Byzantine emperor, he claimed Muscovy to be the successor state of the Roman Empire, the "Third Rome". The immigration of Byzantine people influenced and strengthened Moscow's identity as the heir of Orthodox traditions. Origin When the Mongols invaded the lands of Kievan Rus' in the 13th century, Moscow was still a tiny town within the principality of Vladimir-Suzdal. Although the Mongols burnt down Moscow in the winter of 1238 and pillaged it in 1293, the outpost's remote, forested location offered some security from Mongol attacks and occupation, while a number of rivers provided access to the Baltic and Black Seas and to the Caucasus region. Muscovites, Suzdalians and other inhabitants of the Rus' principality were able to maintain their Slavic, pagan, and Orthodox traditions for the most part under the Tatar Yoke. More important to the development of the state of Moscow, however, was its rule by a series of princes who expanded its borders and turned a small principality in the Moscow River Basin into the largest state in Europe of the 16th century. The first ruler of the principality of Moscow, Daniel I (d. 1303), was the youngest son of Alexander Nevsky of Vladimir-Suzdal. He started to expand his principality by seizing Kolomna and securing the bequest of Pereslavl-Zalessky to his family. Daniel's son Yury (also known as Georgiy; ruled 1303–1325) controlled the entire basin of the Moskva River and expanded westward by conquering Mozhaisk. He then allied with the overlord of the Rus' principalities, Uzbeg Khan of the Golden Horde, and married the khan's sister. The Khan allowed Yuriy to claim the title of Grand Duke of Vladimir-Suzdal, a position which allowed him to interfere in the affairs of the Novgorod Republic to the north-west. By the early 14th century, Moscow had improved its standing against other towns within its parent duchy of Vladimir-Suzdal, and by the 1320s, it emerged