Waterdeep was ruled by a sixteen-seat council whose membership was largely secret. These hidden Lords of Waterdeep maintained their identities behind magical masks, called the Lord's Helm, and while they ruled in public, none knew the true identities of most of them. The subject of who the Lords were became a common topic of noble conversation, and some considered it a game to discover the Lords' identities, a game made more confusing by the fact the Lords themselves set their own rumors afloat.
The City Watch was the local police force whose duty it was to capture criminals, settle petty disputes, give directions, summon medical and priestly aid, generally performing duties that promoted the idea that Waterdeep was a city open to all who knew how to behave themselves.
Rulings on the city's laws were issued by the Magisters, more commonly referred to as Black Robes. They had the duty of running the courts and issuing sentences to those that were found guilty. The Black Robes were each protected by at least six members of the City Guard while traveling the streets of Waterdeep. Those who were convicted could request trial by the Lord's Court and appeal to the masked lords themselves, but faced strict punishment if their claims were ruled as frivolous.