“The Servile State” by Hillaire Belloc isn’t necessarily pro-monarchy or pro-feudalism, but it definitely draws a line between a powerful monarchy that far exceeds any of its subjects in terms of assets, vs an impoverished monarchy that is surrounded by an oligarchy of powerful landowners. And so it much prefers the sort of economics that you get, say, with the 11th and 12th c. Britain, than you do once you get into Tudor territory.