Joffrey Baratheon made liberal use of the Blackwatch during his reign as King, so much so that they were called his 'boogymen'. Literally anything goes for the Blackwatch, as they were used to enforce the rule of the Iron Throne by way of fear. They acted as the secret police / special forces for the Seven Kingdoms. The Blackwatch (also mockingly known as King Joffrey's Boogeymen and later Cersei's Loyalists) is a secret order of knights founded shortly before the outbreak of the War of the Five Kings. Think of it as a 'secret army' of sorts, serving the Iron Throne by fighting battles that don't necessarily occur on large battlefields or in great halls.' ― Cersei Lannister describes the Blackwatch to Ser Roman Mercer.
