The year is 1100. Pick a region to rule with absolute authority. For example you could not pick Spain, but you could choose Castile or Leon. If the country is small enough, like Aragon then you can have the entire country. Conquer your neighbors or be at peace and be conquered by them instead. Remember the best defense is offense. One of your greatest threats is rebellion by the peasants, so you must strive to make them happy.
I employ my peasants to build a mill to increase production of wood. +10 wood per turn. Then I breed my pezzies and tax them for all the weddings they had to have.