Serbia started to disintegrate after the death of Stefan Dušan. According to Matteo Villani, an unidentified Serbian lord sought Hungarian assistance against his more powerful (and also unnamed) enemy in the late 1350s. Historians John V. A. Fine and Pál Engel write that the Serbian lord was a member of the Rastislalić family; Gyula Kristó and Iván Bertényi identify him as Lazar Hrebeljanović. Royal charters of 1358 show that Hungarian troops fought in Serbia in October 1358. The next summer Louis also marched to Serbia, but Stefan Uroš V of Serbia avoided battle.