As direct vassals, I have the doge of croatia, the doge of dioclea, and the doge of tripoli. These guys are a huge souce of income for me, but I can't take on any more republics. and yet both genoa and venice are really good as republics, I don't think I want to give them to feudal vassals. I could probably bury tripoli under the viceroy of syria, but would that help?