Constantine I, Tsar (Second Bulgarian Empire) : All Data

Constantine I was a Tsar who ruled over the Second Bulgarian Empire from 1257 to 1277. During his tenure, he faced several significant wars. One of the most notable conflicts was the War of Succession, which occurred from 1257 to 1258, immediately after Constantine ascended to the throne. Another important war was the Byzantine-Bulgarian War of 1265-1268, where Constantine successfully defended his empire against Byzantine aggression. Additionally, the Mongol invasion of Bulgaria in 1271 posed a major threat to Constantine's rule, but he managed to negotiate a peaceful resolution. Despite the challenges, Constantine I's reign was marked by his ability to protect and maintain the Second Bulgarian Empire amidst external pressures.