Oleg III Svyatoslavich (c. 1147–1204) was a Kievan Rus' prince. His baptismal name was Feodosy. He was prince of Vshchizh (1166–before 1175), of Novgorod-Seversk (1200–1201), and of Chernigov (1201/1202–1204).
Marriages and children
Oleg III married his first wife before 1166. She was a daughter of Prince Andrey Yuryevich of Suzdalia and his Cuman wife and may have been named Euphrosyne.
Oleg's second wife was a daughter of Prince Yuriy Rostislavich of Ryazan and may have been named Euphrosyne.
Oleg had three children: one whose name is unknown (died in 1204), a son named David (died in 1196), and a son named Ingor (died between 1211 and 1223).