De minimis non curat lex - "The law does not concern itself with the smallest things". There must be a minimal level of substance or impact in order to bring a legal action.⏎
Actori incumbit onus probatio - "On the plaintiff rests the proving". The burden of proof falls to the plaintiff, claimant, or petitioner.⏎
Consuetudo pro lege servatur - "Custom is held as law". Where no laws apply to a given situation, the customs of the place and time will have the force of law.⏎