It is possible that Kieron may have been the first Dragon Emperor. Kieron presumably went to war under the rule of Zerika the First. This war could have taken hundreds of years, and it wasn't until AFTER the war that the Jhereg were made a permanent part of the Dragaeran Empire. Aliera says Kieron was killed "Later" by a group of "Lyorn Warriors and Shaman". Given the way Dragaerans think about time, "Later" could be 600-700 years after the formation of the house of Jhereg... The East? The Isles? Lavoding, no doubt. Oh wait, I know: get a jealous-for-Aliera Mario to do it. :)