SO I am the king of Ireland I have 3 dukes How do I get them to improve their cities and castles so I can raise a proper army?
I wonder how anyone can afford upgrades....I can't even upgrade my own plots, they are so expensive....
That sounds like a good idea.Not raising taxes for the first decades, so that your vassals have more money to build the first income buildings is generally a good idea, too.
Better to get 10% from high income and levy numbers than 20% from low ones.