I would have much preferred for Zagreb to remain a Fortress, due to ist central location. But if Ragusa offers a superior infrastructure this hardly leaves us a choice. The outside factors of position really favoured Ragusa for a city, so I am a little disappointed that its training facilities will rob us of its trade potential.
Well as Count of Zagreb you have my authorization to go ahead and convert to a city. At least that will give us access to the Gold ressources by mining them.