Audi alteram partem or audiatur et altera pars - Refers to the idea that one cannot be fairly judged unless the cases for and against them have been heard.⏎
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.⏎
Delegatus non potest delegare - That which has been delegated cannot delegate further.⏎