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The royal household originated as the sovereign's retinue, and had a purely domestic function until the 12th century, after which it became a mainspring of government. The government departments of the Treasury, the Exchequer and the common law courts all originated there. In the 13th century, under Henry III and Edward I, the Royal Wardrobe became a major financial institution. Used as a war treasury, it acted as paymaster to the major military expeditions commanded by the king. It subsequently declined in importance, being replaced by the Chamber. Separate from the king's Wardrobe was the Great Wardrobe, for army clothing and military stores, peripatetic until 1361 and then at Baynard castle, and the Privy Wardrobe, for bows, arrows, pikes, and other weapons, in the Tower of London.