Circumstantial evidence
Under the year 1166, the chronicler reports that the daughter of Prince Andrey Yuryevich of Suzdalia, who had married Oleg, died. Circumstantial evidence shows that the Oleg in question was the son of Svyatoslav Vsevolodovich. On an undisclosed date, Oleg remarried a Ryazan princess; his father-in-law Yury Rostislavich was the younger brother of Prince Gleb Rostislavich of Ryazan.