John I Tzimiskes vs Sviatoslav I

John I Tzimiskes became emperor after assassinating his uncle Nikephoros II Phokas. He was a skilled general and continued the military expansion of the Byzantine Empire.

John I led a campaign against the Rus under Sviatoslav I, who had invaded Bulgaria. He defeated the Rus at the Battle of Dorostolon in 971, forcing Sviatoslav to withdraw. This secured Byzantine control over the Balkans.

John I launched a major campaign into Syria, capturing Damascus, Beirut, and other cities. He advanced as far as Jerusalem, but did not capture it. These campaigns extended Byzantine influence in the Levant.

John I Tzimiskes died suddenly, possibly from poison. His death cut short his ambitious campaigns. He was succeeded by Basil II, who would later become known as the 'Bulgar-Slayer'.

Sviatoslav led a campaign against the Khazar Khaganate, capturing the fortress of Sarkel and sacking the capital, Atil. This destroyed the Khazar state, ending its dominance over the steppes and opening the Volga trade route to Rus control.

Sviatoslav invaded the First Bulgarian Empire at the request of the Byzantine Emperor. He defeated the Bulgarian army, occupied much of the country, and established his capital at Pereyaslavets on the Danube, threatening Byzantium.

After a three-month siege by Byzantine forces under Emperor John I Tzimiskes, Sviatoslav's army was defeated at Dorostolon. He was forced to surrender, renounce claims to Bulgaria, and withdraw from the Balkans.

Returning to Kiev, Sviatoslav was ambushed and killed by the Pechenegs at the Dnieper Rapids. The Pecheneg chief Kurya made a drinking cup from Sviatoslav's skull. His death ended his expansionist campaigns.