Founded in in 200s, the Inquisiton was formed in response to the rampant corruption and crime present in Ravenna. They were brutal, but their efforts helped stem the control of the The Cult of Zelial and stopped Ravenna from collapsing in upon itself. They quickly rose to power within Ravenna, being heralded as heroes while the central government was viewed as mostly inefficient. Using this boost in public opinion, the Inquisition announced their legal separation from the official Ravennan government and were to be considered an independent organization that would sometimes collaborate with the central government.
While this separation legally happened, it never really came to it's full potential, the Inquisition still remaining tied to the Ravennan government.