A supreme or chief regent; someone who rules or governs with the highest authority, often as a regent (substitute ruler for a monarch).
From 'arch-' (chief, supreme) + 'regent' (from Latin 'regens,' present participle of 'regere' meaning to rule). Used historically to describe senior government figures ruling on behalf of absent or young monarchs.
This word appears in European court histories—imagine a regent governing while the king is a child, but an 'archregent' has even more power, maybe overseeing multiple regents. It's a word that reveals how medieval hierarchies worked.
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