モンゴルのルーシ侵攻
Okolnichy (, ) was a Russian "boyar" in one of the highest ranks (or positions) close to the Tsar at the court of Moscow rulers from the Mongol invasion of Rus' until the government reform undertaken by Peter the Great. The word is derived from the Russian word for "close," "near," meaning "sitting close to the Tsar." In the middle of the XVI century it became second (junior, below) to boyar.