In the Corporate Metagame
It was mentioned in the headline story of SSN #42.
SSN reporter Demmalition1 was the first to name the dragon Prince in Purple Reign, a very detailed account of the events that took place on the night of the aforementioned 2077 gubernatorial election.
In Corporate SINs
MMFEC first met Prince on a run to retrieve the drone eye lost by Thoth, an SSN reporter. This drone contained the first pictures taken of Prince near the Shiawase building in Seattle. MMFEC found the drone, surprisingly, in a Shiawase warehouse among the possessions of a Saeder-Krupp employee, Elijah Burnett.
The Hand of Dusk
While Brennus Ciaradh has remained largely out of view, MMFEC has had several run-ins with representatives and goons of The Hand of Dusk. This organization created by or around Ciaradh purports to end the domination of megacorporations over the world.
Lost in space
Brennus Ciaradh was killed, or at the very least, trapped by the detonation of a nuclear device in the astral rift created and sustained by two groups of mages from the Hand of Dusk. Ciaradh had entered the rift to safely go from a temporary base in the Redmond Barrens to the space station his cult had launched and set up in orbit. Scarlet Fyre was responsible for planting the device, MMFEC didn't interfere.