"I arranged for the notable Celia Camoran to want to read a particular Elder Scroll. Don't ask how. However, she will be... unavoidably detained.
I can't think why the Grey Fox would lie to you and invent a fake name.
The "notable" bit before her name suggests she is very well-known. I doubt the Moth Priests would let a nobody borrow one of their treasured Elder Scrolls, so they must recognise her as a person of power and status within the Empire. And of course they even expected her to just stroll right into White Gold Tower . . . a place off-limits to everyone except for the Emperor and Elder Council.
Perhaps Celia is even supposed to be a member of the Council? Chancellor Ocato tells you that most of the Elder Council members have returned to the provinces, except for a small inner core group who have remained in the IC to manage the Empire. So Celia could be one of these shadowy missing figures in the government.
Of course you can only guess. Who knows what the devs had in mind when the made up that line.
Later in that same quest the Countess of Anvil threatens to report the Gray Fox to the Emperor himself . . . which is pretty odd, since the Emperor is now long dead.
Speaking of the Camorans, is Mankar's wife ever named, the mother of his two children?