<diacritize> Medieval Munster had about 10,000 inhabitants and was enclosed by an almost impregnable system of defenses , about 300 feet 90 m wide and some 3 miles 5 km in circumference . <yor>Medieval Münster had about 10,000 inhabitants and was enclosed by an almost impregnable system of defenses , about 300 feet 90 m wide and some 3 miles 5 km in circumference . 