The valves of the heart become less pliant over time. Also, calcium deposits may develop on the valves, preventing them from sealing completely. this can result in mitral valve prolopse, mitral regurgitation and ultimately congestive heart failure.
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Since the middle ages had no knowledge of the brain or its functions there were several ideas about intelligence and the soul. The heart was considered to be one of the places where these were located.
A person was considered old when they were in their 40s.
A person who makes shoes.
a serf is a person who worked on the lord manor and make food
No one single person encouraged the Crusades. These military campaigns were sanctioned by the Latin Roman Catholic Church during the High Middle Ages and Late Middle Ages.