Harald Hårfagre, jarl of Viken, starts with some event troops. I picked the ambition to become king of Norway, and started to subjugate as much of Scandinavia as I could. While that was going on, I sent a small expedition to conquer Capua, reliogiusly isolated, as a base in the Mediterranean. Then I started to prepare invasion of Bulgaria before my holding size grew too much in Norway, and raided the shit out of the rich Italian city-states. I invaded Bulgaria with event troops and mercenaries while they were fighting somone in the north. Then I converted to Orthodox, and swore fealty to the Byzantine emperor. I used the prestige and money from Italy to pay everyone to support my claim to the imperial throne. I had no levies myself, but I had full vassal levies from the other rebels, and Harald is a good commander, even if I almost died in personal combat against the emperor