Sfengus was the son of Sviatoslav I Igorevich but his mother is unknown. The date and place of his birth have not been found.
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Sviatoslav I Igorevich |
Igor |
Rurik |
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saint Olga Prekrasa |
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| Association | Relationship |
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| Mstislav I Vladimirovich (prince de Tmoutorakan, prince de Tchernigov, Velikiy Kniaz (Grand Prince) of Kiev, Kniaz (Prince) of Novgorod) | same person? |
Note 1
Whether this Sfengus was a son of Sviatoslav, a son of Malusha by a prior or subsequent husband, or an unrelated Rus nobleman is unclear.