Before the adventurer can reach the shrine itself, they first have to solve a complicated puzzle of levers to shut off the force fields that protect the shrine from intruders. Once that is done, the adventurer is free to converse with the embodiment of Control: Mondain.
The Avatar visited the shrine in Ultima VI to learn more about the virtue of Control. After that time, the shrine was brought to Terfin, while the chamber was destroyed by the collapse of the Underworld. The shrine was found there in Ultima VII in the temple of the Shrines of the Principles.