was buried in the Anatolian city of İznik, in Buzău, Wallachia, or even as far south as the Mediterranean island of Corfu or as far north as the Polish city of Gdańsk. The toponym Babadağ (Turkish for "Old Man's Mountain", later adapted into Romanian as Babadag) is a probable reference to Sari Saltik, and a Dobrujan Muslim account recorded by chronicler Evliya Çelebi in the late 15th century has it that the name surfaced soon after a Christian attack partly destroyed the tomb. The oldest madrasah in Dobruja and Romania as a whole was set up in Babadag, on orders from Bayezid II (1484); it was moved to Medgidia in 1903. From the same period onwards, groups of Muslim Tatars and Oghuz Turks from Anatolia were settled into Dobruja at various intervals; in 1525, a sizable group of these, originating from the ports of Samsun and Sinop, moved to Babadag. Bayezid also asked Volga Tatars to resettle into northern Dobruja. In late medieval Wallachia and Moldavia In the two Danubian Principalities, Ottoman suzerainty had an overall reduced impact on the local population, and the impact of Islam was itself much reduced. Wallachia and Moldavia enjoyed a large degree of autonomy, and their history was punctuated by episodes of revolt and momentary independence. After 1417, when Ottoman domination over Wallachia first became effective, the towns of Turnu and Giurgiu were annexed as kazas, a rule enforced until the Treaty of Adrianople in 1829 (the status was briefly extended to Brăila in 1542). For the following centuries, three conversions in the ranks of acting or former local hospodars are documented: Wallachian Princes Radu cel Frumos (1462–1475) and Mihnea Turcitul (1577–1591), and Moldavian Prince Ilie II Rareș (1546–1551). At the other end of the social spectrum, Moldavia held a sizable population of Tatar slaves, who shared this status with all local Roma people (see Slavery in Romania). While Roma slavery also existed in Wallachia, the presence of Tatar slaves there has not been documented, and is only theorized. The population may have foremost comprised Muslim Nogais from the Budjak who were captured in skirmishes, although, according to one theory, the first of them may have been Cumans captured long before the first Ottoman and Tatar incursions. The issue of Muslim presence on the territory of the two countries is often viewed in relation to the relations between the Ottoman Sultans and local Princes.