Andronikos I Komnenos vs Rurik

Andronikos I Komnenos led a revolt against the regency of Empress Maria of Antioch, entering Constantinople with popular support. He had the empress imprisoned and later executed, and then had the young emperor Alexios II strangled, making himself sole ruler.

Andronikos I instigated a massacre of Latin (Western European) residents in Constantinople, targeting merchants and their families. The violence killed thousands and severely damaged Byzantine relations with the West, contributing to the later Fourth Crusade.

Andronikos I initiated a reign of terror, executing numerous aristocrats and officials he suspected of disloyalty. His purges weakened the Byzantine nobility and military leadership, creating widespread fear and instability within the empire.

Andronikos I was overthrown by a popular uprising in Constantinople led by Isaac II Angelos. He was captured while trying to flee, and the mob subjected him to three days of torture, including having his hand cut off and an eye gouged out, before he was killed in the Hippodrome.

According to tradition, Rurik sent his lieutenants Askold and Dir to raid Constantinople. While the historicity is uncertain, this event is associated with the first Rus' attack on the Byzantine Empire, highlighting early Rus' expansion.

According to the Primary Chronicle, Rurik, a Varangian chieftain, was invited by Slavic and Finnic tribes to rule over them. He established his capital at Novgorod, founding the Rurik dynasty that would rule Kievan Rus' and later the Tsardom of Russia until 1598.

Rurik consolidated his rule over Novgorod and the surrounding territories, suppressing a rebellion led by Vadim the Bold. He established a centralized authority that became the basis for the early Russian state.