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In page Primary Chronicle:

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Chronology of major events:[1]

  • Ca. 945: Prince Igor was murdered in the act of uprising by the Derevlians. His wife Olga assumed the throne following her husband's death and brought revenge upon Igor's murderers. Some of the Derevlians were burned in their homes, others were buried alive, while the remaining were simply slaughtered. Olga later ruled as a regent for her young son Svyatoslav, who went on to have an extensive military career as an adult, venturing East against the Khazars and the Bulgars.[citation needed]
  • 972: Svyatoslav was killed in a Pecheneg ambush while returning from one of his frequent campaigns against the Greeks.[citation needed]
  • 973: The reign of Yaropolk began and was complicated by quarrels with his two brothers, Oleg and Vladimir.[citation needed]