Superintendent John May was the first commander of the Metropolitan Police A Division, which policed the Whitehall area of London. Since the divisional station house was adjacent to the offices of the Joint Commissioners, Charles Rowan and Richard Mayne, May began to serve as unofficial second-in-command of the force, providing a link between the Commissioners and their men. Wikipedia
The definitive Wikipedia entry for John May. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/John_May_%28police_officer%29