Sviatopolk I of Kiev

Sviatopolk I Vladimirovich (also called Sviatopolk the Accursed or the Accursed Prince; Old East Slavic: Свѧтоплъкъ, romanized: Svętoplŭkŭ; c. 980 – 1019) was Prince of Turov from 988 to 1015 and Grand Prince of Kiev from 1015 to 1019. He earned his sobriquet after allegedly murdering his brothers during his bid to take the throne. His actual responsibility is disputed by historians.

The Svyatopolk-Mirsky family of Rurikid origin attribute their descent from Sviatopolk. Tsar Peter the Great recognized their descent during his reign.

Source: Wikipedia — https://en.wikipedia.org/wiki/Sviatopolk_I_of_Kiev