Combined Bulgarian and Cuman army under Kalojan ambushes and defeats forces of the Latin Empire of Constantinople in the Battle of Adrianople.

Kaloyan or Kalojan, also known as Ivan I, Ioannitsa or Johannitsa, the Roman-Slayer, was emperor or tsar of Bulgaria from 1196 to 1207. He was the younger brother of Theodor and Asen, who led the anti-Byzantine uprising of the Bulgarians and Vlachs in 1185. The uprising ended with the restoration…