Bulgaria is founded as a Khanate on the south bank of the Danube, after defeating the Byzantine armies of Emperor Consta681年的今天，保加利亚在于多瑙河三角洲以南的地区击败了康斯坦丁四世皇帝下的拜占庭帝国军队后，在多瑙河的南岸建立了可汗领土。