One of the items on my list of topics for this blog is medieval demographics and the feudal system. Today I ran across "The Medieval Kingdom" over at The Fascinating World of Charles Ryan. Charles hasn't been posting much lately, which I guess is how I missed it before now. I might get around to delving more deeply into demographics at some point (I find the subject fascinating, but most people appear bored to tears by it; can't for the life of me see why). In the meantime, you should read Charles's essay. He knows more about the subject than I ever will.