This is a very long history lesson. This falls under the category of demonstrating to The Powers That Be that we know what we are doing. In short, the CITY OF LONDON (not London, the city, but the small sovereign city-state, akin to and in alignment with, the sovereign city-state of Washington DC and the sovereign city-state of Vatican City) is where the Four Inns of the Court were first established, and the Law was issued via the authority of these Inns as well as the Temple Bar (because all law originated through the Bible and temples of the papacy). The Bar is the entrance to the court; all who wish to address the court must appear at the Bar. The Lord Mayor of the CITY OF LONDON is sovereign, is a monarch! And the Queen is his subject! When the Queen of England goes to visit the City she is met by the Lord Mayor at Temple Bar, the symbolic gate of the City. She bows and asks for permission to enter his private, sovereign State.