I am very interested in social stratification in England/France over the last 1000 years. I have a premise that revolves around the modern narrative of the middle class comparing it to previous middle classes and I'm trying to read as much about stratification as I can.

I remember reading about a 18th C. Sociologist who divided England up into seven classes ranging from the destitute to the truly rich while comparing their income levels. (I read this when I was around 10 in Horrible History's Gorgeous Georgians.)

If anyone knows the name of this English guy I would be really happy.

Also, I'm especially interested in relative incomes of peasants, knights, barons and upwards in Medieval England. I know it's a long time range, but anything will do.