The medieval period was shaped by cross-cultural exchange, religious conflict, and devastating pandemics. The Silk Road, a network of trade routes connecting China to the Mediterranean from around 130 BCE to the 15th century, facilitated the exchange of silk, spices, ideas, religions, and technologies between East and West. In the eastern Mediterranean, the Byzantine Empire (330–1453 CE) preserved Roman law, Greek culture, and Christian theology while serving as a bulwark against Islamic expansion into Europe for centuries.
The rise of Islam dramatically reshaped the medieval world. Muhammad (c. 570–632 CE) received revelations compiled in the Quran, and Islam rapidly spread from the Arabian Peninsula, creating a vast empire. The Islamic Golden Age, spanning roughly the 8th to 14th centuries, was a period of remarkable scientific, cultural, and economic flourishing during which Muslim scholars made advances in algebra, medicine, astronomy, and philosophy, preserving and building upon Greek and Roman knowledge. The religious and territorial conflicts between Christianity and Islam culminated in the Crusades (1096–1291), a series of religious wars that had lasting effects on Christian-Muslim relations, trade, and European political development. Meanwhile, the Mongol Empire (1206–1368), founded by Genghis Khan (c. 1162–1227), became the largest contiguous land empire in history, connecting East and West through trade and communication but also causing massive destruction and population loss.
Medieval Europe was organized around feudalism, a system in which lords granted land (fiefs) to vassals in exchange for military service and loyalty, while peasants (serfs) worked the land and were bound to it. The Magna Carta (1215), signed by England's King John, established the principle that the king himself was subject to law, laying the groundwork for constitutional government and individual rights. The medieval world came to a dramatic close with the fall of Constantinople to the Ottoman Turks in 1453, which ended the Byzantine Empire, shifted trade routes, and prompted European exploration for new paths to Asia. Earlier, the devastating Black Death (1347–1353), a bubonic plague that killed an estimated 75–200 million people in Eurasia, had contributed to severe labor shortages, social upheaval, and the eventual decline of feudalism, transforming European society from within even as outside forces reshaped its borders.