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A man-at-arms was a soldier of the High Medieval to Renaissance periods who was typically well-versed in the use of arms and served as a fully-armoured heavy cavalryman. A man-at-arms could be a knight, or other nobleman, a member of a knight's or nobleman's retinue, or a mercenary in a company serving under a captain. Such men could serve for pay or through a feudal obligation. The terms knight a... Wikipedia