During the reign of the the Great Oz, it was the Guardian's duty to ensure that everyone (including animals and creatures) who entered the city was fitted with green spectacles, ostensibly to protect their eyes from the brightness and glory of the city. The green glasses were locked in place with a key on a chain worn around the Guardian's neck. Later, after the city was conquered by General Jinjur and her Army of Revolt, the use of the green spectacles was forgotten, but the Guardian continued to keep watch at the gates.