Principality of Chernigov
According to the Primary Chronicle, in the early 11th century, Anthony, a Christian monk from Esphigmenon monastery on Mount Athos, originally from Liubech of the Principality of Chernigov, returned to Rus' and settled in Kyiv as a missionary of monastic tradition to Kyivan Rus'. He chose a cave at the Berestov Mount that overlooked the Dnieper River and a community of disciples soon grew. Prince Iziaslav I of Kyiv ceded the whole mount to the Anthonite monks who founded a monastery built by architects from Constantinople.