I tried doing a search for this and checked the FAQ but couldn't find anything. Apologies if this has been asked before.
What was the world's first permanent police force? What is the first case we have of someone who's sole purpose is enforcing laws? How would they have been selected or hired? What would an average day have looked like for them?
ah right... this should be in the FAQ by now! there's always room for more info about the development of law enforcement in various cultures, but meanwhile, here are a few previous threads
At what point did societies begin making a distinction between military and police? - England, Rome
Before the modern era where did people go to report crimes? Who were their 'police' basically? - China, Greece, Iceland, Japan, Visigoths, Germany
Did ancient greek cities have any kind of police force? - more about Greece