Rondel dagger

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A rondel dagger /ˈrɒndəl/ or roundel dagger is a type of stiff-bladed dagger used in Europe in the late Middle Ages (from the 14th century onwards), used by a variety of people from merchants to knights. It was worn at the waist and could be used as a utility tool, or worn into battle or in a jousting tournament as a side arm.