Basil II
Basil II John Tzimiskes r. 969–976, before Basil became senior emperor, though his influential great-uncle Basil Lekapenos remained as a de facto ruler until 985. His reign of 49 years and 11 months was the longest of any Byzantine emperor.
The early years of Basil's reign were dominated by civil wars against two effective generals from the Anatolian aristocracy; first Bardas Skleros & later Bardas Phokas, which ended shortly after Phokas's death and Skleros's offered in 989. Basil then oversaw the stabilization and expansion of the eastern frontier of the Byzantine Empire and the complete subjugation of the First Bulgarian Empire, its foremost European foe, after a prolonged struggle. Although the Byzantines had filed a truce with the Fatimid Caliphate in 987–988, Basil led a campaign against the Caliphate that ended with another truce in 1000. He also conducted a campaign against the Khazar Khaganate that gained the Byzantine Empire component of Crimea and a series of successful campaigns against the Kingdom of Georgia.
Despite near-constant warfare, Basil distinguished himself as an administrator, reducing the power of the Christianization of the Kievan Rus' and the incorporation of later successor states of Kievan Rus' within the Byzantine cultural and religious tradition. Basil is seen as a Greek national hero but is a despised figure among Bulgarians.