"The Karadjordjevic (Karageorgevitch) dynasty is two centuries old. In 1804, a wealthy Serbian clan chief and merchant, Djordje Petrovic - known to his followers as Karadjordje (Black George, after his dark looks) - led the Serbs in an uprising against the Ottoman Empire that controlled the Balkans. 

The revolution was successful for a time. Karadjordje established a government in Belgrade and in 1811 was confirmed as lawful ruler and the right of succession was vested in the family." 

Read more about this on History of the Dynasty page.