The Early Middle Ages saw the continuation of trends set in Late Antiquity, depopulation, deurbanization, and increased barbarian invasion. North Africa and the Middle East, once part of the Eastern Roman Empire, were conquered by Islam. Later in the period, the establishment of the feudal system allowed a return to systemic agriculture. There was sustained urbanization in northern and western Europe. During the High Middle Ages (c. 1000 - 1300), Christian-oriented art and architecture flourished and Crusades were mounted to recapture the Holy Land. The influence of the emerging nation-state was tempered by the ideal of an international Christendom. The codes of chivalry and courtly love set rules for proper behavior, while the Scholastic philosophers attempted to reconcile faith and reason. Outstanding achievement in this period includes the Code of Justinian, the mathematics of Fibonacci and Oresme, the philosophy of Thomas Aquinas, the painting of Giotto, the poetry of Dante and Chaucer, and the architecture of many great cathedrals such as Notre Dame de Paris.
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