Are you looking for general histories of particular places at those times?

For ~1000-1300ad Western Europe , you're looking at medieval "state building" historians. They primarily focus on finding the connection- or not finding the connection of the modern "state" in evolving "feudal" society focused on aristocratic and noble interactions

Authors like Susan Reynolds, her book Communities and Kingdoms in Western Europe, 900-1300

as well as Robert Bartlett and his book- The Making of Europe: Conquest, Colonization, and Cultural Change, 950-1350

I'll tack Thomas Bisson, The Crisis of the Twelfth Century: Power, Lordship, and the Origins European Government on to here for you too.