This is a quote from william of Orange , appealing to be the new king via the glorious Revolution.

and is thus a foundational principle of our law (read the war makes the law)

“though it is apparent that all acts made by popish magistrates are null and void of themselves, so that no Parliament can be lawful for which the elections and returns are made by popish sheriffs and mayors of towns; and, therefore, as long as the authority and magistracy is in such hands, it is not possible to have any lawful Parliament.”

(Declaration of the prince of Orange 1688