when did the roman empire reached its peak
Roman Empire Diocletian divided the empire into four regions, each ruled by a separate emperor, the Tetrarchy.[27] Confident that he fixed the disorders that were plaguing Rome, he abdicated along with his co-emperor, and the Tetrarchy soon collapsed. Order was eventually restored by Constantine the Great, who became the first emperor to convert to Christianity, and who established Constantinople as the new capital of the eastern empire. During the decades of the Constantinian and Valentinian dynasties, the empire was divided along an eastâ€“west axis, with dual power centres in Constantinople and Rome. The reign of Julian, who attempted to restore Classical Roman and Hellenistic religion, only briefly interrupted the succession of Christian emperors. Theodosius I, the last emperor to rule over both East and West, died in 395 AD after making Christianity the official religion of the empire.[28]
Lindisfarne In 793, a Viking raid on Lindisfarne[37][d] caused much consternation throughout the Christian west and is now often taken as the beginning of the Viking Age. The D and E versions of the Anglo-Saxon Chronicle record:
Red Fort It was designated a UNESCO World Heritage Site in 2007 as part of the Red Fort Complex.[2][6]
Roman concrete It is uncertain when Roman concrete was developed, but it was clearly in widespread and customary use from about 150 BC; some scholars believe it was developed a century before that.[3]