Ringen is the German language term for grappling (wrestling). In the context of the German school of historical European martial arts during the Late Middle Ages and the German Renaissance, Ringen refers to unarmed combat in general, including grappling techniques used as part of swordsmanship. The German tradition has records of a number of master-Ringer of the 15th to 16th centuries specializing in unarmed combat, such as Ott Jud. Medieval and early Renaissance wrestling treatises present both sport and combat techniques together as one art.
https://en.wikipedia.org/wiki/Ringen