Of course, "ages" are constructs of historians, and no one at the time ever woke up and said, "Honey, guess what: the Middle Ages began this morning!" But if we want to point to a time when the revival of Europe after the disappearance of the Western Roman Empire really began, we could do a lot worse than say, "1000 A. D." As of the year 1000, the population of France was around 6 million, and Germany about 4 million. By 1300, both those numbers had roughly tripled, with France at around 19 million and Germany 12 million. And at the same time, there were great migrations from these areas into Iberia, Poland, and the Baltic region. The period saw improved farming techniques, the creation of the modern university, the foundations laid for modern science, the building of many great cathedrals, the rediscovery of much lost Greek thought, and the beginning of Europe's re-urbanization. Then a small problem, the Black Death, struck, wiping out about ha...