Adrian was transported just outside the Holy City of Light, Sanctus. He was teleported to a paved road that was made using marble. If anyone were to see the city then it could only describe it as shining. This is one of the independent cities that is not in the control of the empire despite near the borders of the empire.
The reason the Holy City of Light is not regulated by the Empire is that the Pope of the Church of Light manages this city. Since even the empire does not dare control the Holy City, how could other kingdoms do so. Another reason is that the current Pope is related to the Emperor. Another reason is that the imperial family is said to be descendants of the Sun god which in turn is a son of the Goddess of Light.
Adrian walked on this paved marble roads and immediately stopped in his tracks. He looked for a nearby shady area where no people could see him and went there.