To provide with a stool, or to seat someone on a throne or position of authority.
From 'en-' plus 'stool', an Old English word for a seat. In royal or ceremonial contexts, this verb was used to describe the formal act of installation or coronation, treating the stool/throne as a symbol of power.
Historians found this word in medieval coronation records—to enstool a king meant literally and symbolically placing them in their seat of power, combining the physical act with the transfer of authority in a single verb.
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