Since Time Immemorial

Since Time Immemorial is a designation used in Rockallic legal texts for certain historic events and commencements of the existence of important institutions of society.

Usage for historic events
The Creation of the Constitution has happened Since Time Immemorial, which means that legally the Constitution has existed for as long as it has existed. This is used to indicate that the Constitution is "the most important piece of law of the Earldom and that it has existed and always will exist", according to the Constitution itself.