Vigilantibus non dormientibus aequitas subvenit - "Equity aids the vigilant, not the sleeping." Concept that if an opposing party unreasonably delays bringing an action, that it is no longer considered just to hear their claim, due to fundamental changes in circumstance brought upon by their delay.⏎
Res ipsa loquitur - "The thing speaks for itself." Used in tort law when there is no proof of what caused the harm, but it is most likely only the thing that could have caused the harm.⏎
Salus populi suprema lex esto - "The good of the people shall be the supreme law." Used variously as a motto, a reminder, or a notion of how the law and governments in general should be.⏎
Rex non potest peccare - "The king can do no wrong." Used to describe the basis for sovereign immunity.⏎