A person who makes a solemn promise or pledge based on their faith or personal honor rather than legal security.
From Latin fides (faith) and promissor (one who promises). This legal term combines two Latin roots to describe someone binding themselves by their reputation and integrity.
A fidepromissor was literally putting their personal fides on the line—if they broke the promise, they lost their reputation and social standing forever. In tight-knit communities, that was worse than any fine.
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