Probably the best known such ceremony is the one that takes place every night at the Tower of London, and has done so in some form or another since the 14th century. At exactly 9.53pm, the Chief Yeoman Warder, dressed in Tudor Watchcoat, meets the military escort, made up of members of the Tower of London Guard. Together, the Chief Yeoman Warder and the Yeoman Warder 'Watchman' secure the main gates of the Tower. Upon their return down Water Lane, the party is halted by the sentry and challenged to identify themselves: Chief Warder: "God preserve Queen Elizabeth."Sentry: "Amen!"