He was a knez before the uprising. He joined the uprising at the beginning, in 1804, and rallied people in the Morava and Stig regions. He participated in the Siege of Požarevac (1804), besieging the town from Morava to Salakovac. His trench was situated in Gornja Mala. Momir and Milenko Stojković cleansed the southern part of the Požarevac district from Ottoman forces. After the liberation of Požarevac, Karađorđe appointed him the knez of Morava (Moravska knežina).
Paulj Matejić begged for the hand of Momir's daughter for his son Budimir,[1] and they married.
Momir had a mansion in Lučica, fenced by palisade.