The Frankish king Charlemagne led armies in battle, united much of medieval Europe under his rule, and was crowned emperor by the pope. Nonetheless, he also had enough time on his hands to become an avid hunter, pursuing deer, wild boars, birds, and other game, often in forests and walled parks near his palaces. This was no idle hobby. For Charlemagne, hunting had numerous benefits, according to MIT historian Eric Goldberg. For one thing, Charlemagne used the practice to demonstrate his masculine strength into his 60s, after he stopped commanding…