This work illuminates four centuries of medieval history, from the expansion of Latin Christendom, from its base in France, Western Germany and North-Central italy into the European outskirts, at a time of rising population, economic growth and dynamic cultural change. This expansion also saw the English colonization in the Celtic world, German immigration into much of Eastern Europe, the reconquest of Spain and Sicily, as well as the introduction of Christianity to Bohemia, Hungary, Poland and Scandinavia.