Konyushy (Russian: Конюший) is literally translated as Master of the Horse, Equerry.
Konyushy was a boyar in charge of stables of Russian rulers. It was a high title at the court of Russian rulers until the 17th century.
By the end of the 15th century a special Equerry Office (конюшенный приказ, "konyushenny prikaz") was introduced, headed by the Konyushy. It was in charge of Tsar's stables, Tsar's parade equipage, ceremonies of court ride-offs, and military horse breeding. At some time Boris Godunov was konyushy.
The Equerry Office handled a significant amount of Tsar's treasures, related to harness and horse/horseman armor, which were transferred to the Armoury (Kremlin) in 1736.
See also: Koniuszy.