Ancient custom has the force of law.
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About Legal maxim
Legal maxim was established principle of law. A legal maxim is an established principle or proposition of law, and a species of aphorism and general maxim. The word is apparently a variant of the Latin maxima, but this latter word is not found in extant texts of Roman law with any denotation exactly analogous to that of a legal maxim in the Medieval or modern definition, but the treatises of many of the Roman jurists on regular definitiones and sententiae iuris are to some degree collections of maxims. Read more on Wikipedia →