CENTRAL ASIAN “BULAT HELM” OF THE END OF THE 16TH — THE FIRST THIRD OF THE 17TH CENTURY FROM AMONG THE GIFTS OF ERDENI DAI MERGEN NANGSO In this paper the authors analyze a richly decorated iron helmet from the holdings of the Moscow Kremlin Museums (inventory number OR–2058) which has never been closely examined before. The headgear is stated to have been sent as a gift from a Khotogoid lama, Erdeni Dai Mergen Nangso, to Tsar Michael I of Russia, on 14 January 1635. The helmet was deposited in the treasury of the Kazenny Dvor (Treasury Court) no later than 29 November 1636, and transf