The leader of a monastery in the Middle Ages was an Abbot.
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An abbot is the leader of a Monastery. IF the leader was a woman, she was called the abbess.
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Thomas Aquinas
a pope or priest is a religious leader
Hideki Tojo.
A local parish was usually lead by a priest.
Charlemagne
King Edward.
The order was the Pope, Cardinals, Priest and the Monks or Nuns..