A hell of a lot of medieval stuff to get through, but really comes alive when he hits the 18th century or so. Wish there was more history like this being written! Serious, accessible, unashamedly Marxist without feeling the need to genuflect to seven different theorists and dress up fairly straightforward stuff in American academic mystification.
It's written in 1985, as the miners strike was being broken and you really feel it. Williams was not even particularly confident that Wales would continue to exist. Funny that he couldn't see a future for the place, but he points to it all through the final chapters. Worth your time!