Justin

Justin was an imaginary playmate of Uriel Septim VII, although young Uriel had insisted a place be set for Justin at every meal. Not only that, Justin, despite the boyish name, had been a girl!

King Symmachus had kept up the joke long after she had gone the way of imaginary childhood friends -- inquiring after Justin's health whenever he and Uriel Septim met, and being responded to in as mock-serious a fashion. The last Barenziah had heard of Justin, several years ago, the Emperor had evidently joked elaborately to Symmachus that she had met an adventurous though incorrigible Khajiit youth, married him, and settled down in Lilandril to raise fire ferns and mugworts.

By asking about Justin, Barenziah made sure that Jagar Tharn imposed the Emperor.

He is mentioned in the "The Real Barenziah, Book V".