Woops, probably should have specified. I mean Justinian II, Heraclian dynasty. I want to know whether he's the last here as well, or if the dynasty ends before him, or if he has kids and they become the Emporer. I NEEDS TO KNOW!
EDIT: I never new wikipedia could be this entertaining! I looked up the list of Emperors to try and guess where you'd go with this, and it felt like I'd opened an intrigue novel! http://en.wikipedia.org/wiki/List_of_Byzantine_emperors
You will know soon enough. As in, within the next hour.

You will find some similarities and many differences between Wikipedia's list and mine. And of course, it'll be quite unrecognizable after 1453.