In 1595, Queen Elizabeth I issued letters patent giving powers to a marshal to maintain order within the City of London. Later, an under-marshal and six city marshalmen were appointed to assist the marshal in his duties. As a result of the Police Acts of 1829 and 1839, the marshal's role changed significantly. , one city marshal, currently Colonel Billy King-Harman, CBE, still acts as peacekeeper to the Lord Mayor of London, leading processions and representing the Lord Mayor at all Entries of Troops (challenging and then escorting those few regiments entitled to march though the City of London).