Article IV has also been cited as the basis for Quebec often having its unique set of laws that are different from the rest of Canada. There was a general constitutional principle in the United Kingdom to allow colonies taken through conquest to continue their own laws. That was limited by royal prerogative, and the monarch could still choose to change the accepted laws in a conquered colony. However, the treaty eliminated that power because by a different constitutional principle since terms of a treaty were considered paramount. In practice, Roman Catholics could become jurors in inferior courts in Quebec and argue based on principles of French law. However, the judge was British, and his opinion on French law could be limited or hostile. If the case was appealed to a superior court, neither French law nor Roman Catholic jurors were allowed.