His father was of Croatian descent but in service to the Austrian border guard as an officer near Knezić.
His mother, Borbála Benkő, was of Hungarian-Serbian descent, related to Mihajlo Latas, a Serb military officer in the Austrian Empire who later escaped and became known as the Turkish general Omar Pasha.
Due to his military success and distinction he quickly rose through the ranks and was promoted to major general after János Damjanich suffered a leg fracture and had to relinquish command as the third Corps Commander, and after this appointment took part in an important siege.
Kossuth gave Knezić a post as governor of Transylvania, but the deterioration of the military situation led to a rather rapid collapse of leadership.
His wife initially attended to him diligently, but with the harvest approaching, Knezićné ordered her in September to return home.