Revolting Islands

[King Kurt]

In my current VI Early Bysantine hard campaign all is going well. The Turks, Egyptians and Hungarians have been subdued, my empire stretchs from Egypt to Kiev via the Balkans. I have lost Naples, but once the fleets are built up, I will be off to sort the Scillians out. The one nusance at the moment is that my Islands - Crete, Rhodes and Cyprus keep revolting. I have reasonable garissons, I am on auto tax and all have ports with ships forming contact with the mainland. The revolts are never very big, so I just ship in a force to wipe them out, but they are a pain. My thoughts are to build some happy buildings like town watch and churchs - any ideas??