Though Miloš had been elected prince by his own people, it was long before he was recognized as such by the Porte. His efforts for the regularization of his position entailed endless negotiations in Constantinople; these were enlivened by frequent anti-Obrenović revolts in Serbia, all of which Miloš successfully quelled. The revolution in Greece in 1821 threw the Serbian question from the international point of view into the shade, but the Emperor Nicholas I, who succeeded his brother Alexander I on the Russian throne in 1825, soon showed that he took a lively and active interest in Balkan affairs. Pan-Slavism had scarcely become fashionable in those days, and it was still rather as the protector of its co-religionists under the Crescent that Russia intervened. In 1826 Russian and Turkish delegates met at Akerman in Bessarabia, and in September of that year signed a convention by which the Russian protectorate over the Serbs was recognized, the Serbs were granted internal autonomy, the right to trade and erect churches, schools, and printing-presses, and the Turks were forbidden to live in Serbia except in eight garrison towns; the garrisons were to be Turkish, and tribute was still to be paid to the Sultan as suzerain. These concessions, announced by Prince Miloš to his people at a special _skupština_ held at Kragujevac in 1827, evoked great enthusiasm, but the urgency of the Greek question again delayed their fulfilment. After the battle of Navarino on October 20, 1827, in which the British, French, and Russian fleets defeated the Turkish, the Turks became obstinate and refused to carry out the stipulations of the Convention of Akerman in favour of Serbia. Thereupon Russia declared war on Turkey in April 1828, and the Russian armies crossed the Danube and the Balkans and marched on Constantinople. Peace was concluded at Adrianople in 1829, and Turkey agreed to carry out immediately all the stipulations of the Treaty of Bucarest (1812) and the Convention of Akerman (1826). The details took some time to settle, but in November 1830 the _hatti-sherif_ of the Sultan, acknowledging Miloš as hereditary prince of Serbia, was publicly read in Belgrade. All the concessions already promised were duly granted, and Serbia became virtually independent, but still tributary to the Sultan. Its territory included most of the northern part of the modern kingdom of Serbia, between the rivers Drina, Save, Danube, and Timok, but not the districts of Nish, Vranja, and Pirot. Turkey still retained Bosnia and Hercegovina, Macedonia, the _sandjak_ of Novi-Pazar, which separated Serbia from Montenegro, and Old Serbia (northern Macedonia). 18 _The Throes of Regeneration: Independent Serbia,_ 1830–1903