The Serbian Revolution was a national uprising and constitutional change in Serbia that took place between 1804 and 1835, during which this territory evolved from an Ottoman province into a rebel territory, a constitutional monarchy, and modern Serbia.^[56] The first part of the period, from 1804 to 1817, was marked by a violent struggle for independence from the Ottoman Empire with two armed uprisings taking place, ending with a ceasefire. The later period (1817–1835) witnessed a peaceful consolidation of political power of the increasingly autonomous Serbia, culminating in the recognition of the right to hereditary rule by Serbian princes in 1830 and 1833 and the territorial expansion of the young monarchy.^[57] The adoption of the first written Constitution in 1835 abolished feudalism and serfdom, and made the country suzerain. These events marked the foundation of modern Serbia.^[58] In mid-1815, the first negotiations began between Obrenović and Marashli Ali Pasha, the Ottoman governor. The result was acknowledgment of a Serbian Principality by the Ottoman Empire. Although a vassal state of the Porte (yearly tax tribute), it was, in most respects, an independent state.