During the reign of Peter the Great, further changes were made. The collar of the newly established Order of Saint Andrew was added around the central escutcheon, and the crowns were changed to the imperial pattern after his assumption of the imperial title in 1721. At about this time, the eagle's color was changed from golden to black, which would be retained until the fall of the Russian monarchy in 1917. A final form for the eagle was adopted by imperial decree in 1729, and remained virtually unchanged until 1853.