Prince Iziaslav I of Kiev ceded the whole mountain to Antonite monks who founded a monastery built by architects from Constantinople.

According to the Primary Chronicle, in the early 11th century, Antony, a Greek Orthodox monk from Esphigmenon monastery on Mount Athos, originally from Liubech in the Principality of Chernigov, returned to Rus' and settled in Kiev as a missionary of the monastic tradition to Kievan Rus'.

[citation needed] In 1043, his father Yaroslav made an agreement with King Casimir I of Poland that recognized Cherven as part of Kiev.

[citation needed] Upon the death of Yaroslav the Wise in 1054, his realm was divided between three of his older sons (Vladimir of Novgorod died before that), Iziaslav, Sviatoslav, and Vsevolod, creating the Yaroslavichi triumvirate that ruled the country for the next 20 years.

[citation needed] In 1068, the Cumans defeated the triumvirate at the Alta river, which dangerously exposed some major cities, including Kiev.

However, Vseslav didn't want to rule Kiev, so he fled in the night, leaving the people of the city with no leader to face Iziaslav and his Polish allies.

Sviatoslav and Vsevolod asked him to show restraint, so he sent his son Mstislav, former prince of Novgorod, to blind and kill the important people.

[citation needed] In 1072, the triumvirate presided over the celebration of the sanctity of Boris and Gleb, which involved the transfer of their relics to a new church in Vyshgorod.

[citation needed] By 1073, Iziaslav had alienated so many people that Sviatoslav and Vsevolod drove him out of Kiev on 22 March in a seemingly bloodless coup.

That summer, Oleg's brother Gleb, who was still ruling Novgorod, was driven out, killed, and replaced with Iziaslav's son Sviatopolk.