Samuel of Bulgaria

Samuel commanded the army under Roman I from 977, effectively ruling the First Bulgarian Empire while the nominal tsar held the throne. He became Tsar outright in 997 and spent nearly every year after in warfare with Basil II and Byzantium, an equal-ambition collision that defined both reigns. Early on he won: his forces took the Serb principality of Duklja in the late 10th century and raided Croatia and Hungary. He moved the capital from Skopje to Ohrid and seated the Bulgarian Patriarchate there, presiding over what some call the Western Bulgarian Empire. From 1001 the tide turned and he fought defense against superior Byzantine armies. At the battle of Kleidion in 1014 his forces were destroyed; he suffered a heart attack and died two months later, on 6 October. His successors mounted no resistance. Four years on, the Empire capitulated and five decades of Byzantine-Bulgarian conflict ended.