For 10 points, name this 1389 Ottoman victory, which occurred at a site that names a disputed territory once part of Serbia.
The losing commander in this battle supposedly cursed his countrymen who did not participate as recorded on the Gazimestan monument. The Knights Hospitaller participated in this battle under the leadership of John of Palisna. A letter to the Florentine government from Tvrtko I is one of the earliest sources on this battle. One side in this battle had been in decline since the reign Stefan UroÂš V "the Weak". After this battle, the commander of the right flank of the winning side killed his brother Yakub, a competitor to his succession. The leader of one side in this battle was apocryphally assassinated when (*) MiloÂš Obilič ("mee-lohsh o-bee-leech") pretended to defect. For 10 points, name this 1389 Ottoman victory, which occurred at a site that names a disputed territory once part of Serbia.
The losing commander in this battle supposedly cursed his countrymen who did not participate as recorded on the Gazimestan monument.
Battle of Kosovo Field