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The cap of Monomachus was part of the regalia of the grand princes and tsars of Russia. This was a golden crown trimmed with sable and decorated with precious stones and a cross. One legend claims that Emperor Constantine Monomachus sent it to Kiev for the coronation of Grand Prince Vladimir II. Another legend says that it was sent to Grand Prince Vladimir I in 988 by Byzantine emperors Basil II and Constantine IX, on the occasion of his baptism and marriage to their sister Anna.