In medieval Europe, particularly from the 11th century onwards, there was a remarkable population growth alongside significant agricultural advances. This agricultural boom not only allowed for an increased food supply, thereby extending life expectancy, but it also catalyzed the rise of new towns. The previous ruins left by the fall of the Roman Empire were revitalized as peasants needed places to market their surplus grain and procure goods like tools and cloth. Towns grew around fairs, castles, and churches, fostering social mobility where serfs could attain freedom by residing for a year without their lord’s oversight. The saying 'Town air makes free' illustrates the allure of urban centers for displaced peasants. New roles emerged, from shopkeepers to skilled craftsmen governed by guilds, marking the establishment of what can be considered a 'fourth order' in society that began to rival the traditional structures of lords and clergy. This period also witnessed the construction of grand cathedrals by local merchants, further embedding towns in the socio-economic fabric of medieval Europe.