Emperor Frederick II spent little time in Germany as his main concerns lay in Southern Italy. He founded the University of Naples in 1224 to train future state officials and reigned over Germany primarily through the allocation of royal prerogatives, leaving the sovereign authority and imperial estates to the ecclesiastical and secular princes. He made significant concessions to the German nobles, such as those put forth in an imperial statute of 1232, which made princes virtually independent rulers within their territories. These measures favoured the further fragmentation of the Empire.