noun
a term used in medieval Latin to refer to an abbot who is not under the authority of a bishop
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The abbots nullius were responsible for overseeing territories that were not under the jurisdiction of any diocese.
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The abbots nullius had a lot of power over their territories.
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The abbots nullius were like the bosses of their areas.
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Being an abbot nullius in his own home, he made all the decisions without consulting anyone else.