Maybe not strange, but hella lucky.
Been bashing my head against the Zoroastrian and Zunist starts, so went for a break with 867 Byzantium to snag that SPQR achievement. After some bumbling in marrying the King of Italy's daughter and Leon taking an unfortunate axe to the face in battle, I got Basil's Italian Catholic grandson on the throne.
Well, no biggy, fight off some rebellions and set up my heir to be trained by the Patriarch to be a good Greek Orthodox so things'll settle down....and y'know, just for giggles I'll have my chaplain 'Research Culture' for the few years before my heir becomes a man.
Well hello there.