The ancient doges were chosen from the royal family of ancient Illyria who after Padua was sacked then Aquiliea, took refuge at the isle of Torcello. The Dux or Doge(Duke)Orso was slain in the year 737. His son Deusdedit was Doge from 742 to 755 when he was over- thrown by the traitor Galla (Galla was over- thrown by popular revolt in 756). Among the related families was the Orseolo family of whom one was named Orso Orseolo. The plural form of this family was dell Orseoli. The royal family of Illyria go back through the kings and princes such as Agron and his wife Teuta,Boetiean King Cadmus and his wife Harmonia, back to Agenor son of Antenor the Trojan (the only family to walk away from the burning city of Troy). They go back to Teukros and his wife Pleione who are very likely descended from Mushku or Moschi, the tribe of Meshech son of Japheth son of Noah. I have a more detailed list if you are interested.