The document summarizes the fragmentation of the ancient world following the fall of the Western Roman Empire in 476 CE. It describes how Germanic tribes invaded and established kingdoms across Europe as the empire dissolved. One such kingdom was the Visigothic Kingdom in Hispania. Meanwhile, the Eastern Roman Empire, centered in Constantinople, managed to survive as the Byzantine Empire for another 1000 years by repelling invaders. It also covers the emergence of Islam in the 7th century and the expansion of Muslim rule across former Roman territories in North Africa and the Middle East.