Nearly all Kings and Emperors were 'poorer' than most Westerners under the poverty line of today. They had no refrigeration, antibiotics, electricity, etc. But we still agree that there are 'poor' people today, and I think we're correct to say so. Yes, it is a moving target, and thank God that it is such. If 'progress' means that we have to drag the least lucky of us up to levels of decadence that Cesar could never have though of, I'm more than on board for that. Quibbling about the exact definition of poor for all of time is useless. Charge ahead, have the 'poor' of our grandchildren's time be the wealthy of today.