When Byzantium, known as the Millennium Empire, finally perished, the western civilization represented by Greece and Rome also came to an end.

In the 6th century, in order to restore the former Roman Empire, the Byzantine Empire fought and conquered everywhere militarily, resulting in an empty treasury and poor people. The country is unable to maintain a huge military force to rule vast areas, and its territory is constantly being eroded by foreign countries. In the following hundreds of years, the country suffered from internal troubles and foreign invasion, and gradually declined. /kloc-in the first half of the third century, western troops marched eastward and conquered and ruled Byzantium for more than half a century. Although Byzantium once restored the motherland, its territory was greatly reduced, divided, its national strength declined, and its regime was in jeopardy and unstable.

/kloc-At the end of 0/3, the Ottoman Turkish Empire rose in West Asia. Ottoman Turkey actively expanded outward, first occupying Asia Minor and then infiltrating into the Balkans, aiming at the Byzantine Empire. /kloc-in the middle of the 0/5th century, Constantinople fell and the Byzantine Empire perished.