A chief minister or administrator who shared supreme judicial and administrative power with another cojusticiar in medieval kingdoms.
From 'co-' + Old French 'justicier,' from 'justice.' This was a specific title in Norman and Angevin England for co-rulers with vast legal power.
Medieval kings had these co-administrators like a built-in checks-and-balances system—two cojusticiars prevented any one person from gathering too much power. It's how medieval monarchies tried to limit absolute rule, centuries before modern democracies.
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