History of the Metropolitan Police Service been headed by a Commissioner, rather than a Chief Constable which is the highest rank in police forces outside London. The first Commissioners to hold the post were Lieutenant-Colonel Sir Charles Rowan and Sir Richard Mayne. When Sir Charles Rowan died, leaving Sir Richard Mayne as the surviving Commissioner, Captain William Hay was drafted in to jointly run the force with Mayne. However, because the two Commissioners did not agree on methods of running the force, since 1855 it was decided that only one Commissioner would run the force. Metropolitan Police patrols took to the streets on 29 September 1829,
Dublin Metropolitan Police Dublin Metropolitan Police The Dublin Metropolitan Police (DMP) was the police force of Dublin, Ireland, from 1836 to 1925, when it was amalgamated into the new "Garda Síochána". The Dublin city police had been subject to major reforms in 1786 and 1808. Organised rural policing in Ireland began when Robert Peel, then Chief Secretary for Ireland, created the Peace Preservation Force in 1814. This rudimentary paramilitary police force was designed to provide policing in rural Ireland, replacing the 18th century system of watchmen, baronial constables, revenue officers and British military forces. Peel went on to found the London Metropolitan Police.