A legal agreement in which one person pledges themselves or their property as a guarantee for another person's debt or obligation.
From Latin 'fideiussio' (a guarantee given in good faith), from 'fideiussor' (guarantor) and 'fidei' (of faith). A key concept in Roman contract law.
Fidejussion was Rome's version of a personal guarantee—if your friend borrowed money and couldn't pay it back, you could vouch for them with your own life and property on the line, which made debt incredibly serious.
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