This "rule" has at times been followed so pedantically that arms that violate it were called "false arms" or "arms of enquiry"; any violation was presumed to be intentional, to the point that one was supposed to enquire how it came to pass. One of the most famous was the shield of the Kingdom of Jerusalem, which had gold crosses on silver. This use of white and gold together is also seen on the arms of the King of Jerusalem, the flag and arms of the Vatican, and the bishop's mitre in the arms of Andorra. These uses of gold on silver indicate the exceptional holy and special status of these Coat of Arms. An example of "colour on colour" is the arms of Albania, with its sable two-headed eagle on a gules field.