Western Roman Empire

When the Emperor Constantine converted to Christianity in 368 AD, he changed the course of European history in ways that continue to have repercussions to the present day. Adopting those aspects of the religion that suited his purposes, he turned Rome on a course from the relatively open, tolerant, and pluralistic civilization of the Hellenistic world, towards a culture that was based on the rule of fixed authority, whether that of the Bible, or the writings of Ptolemy in astronomy and of Galen and Hippocrates in medicine. 

In Volume VI (Chapters LVII - LXXI), Gibbon ends his masterful history by charting the rise of the Turkish nation and the birth of the Ottoman Empire, which becomes an unstoppable force as it eventually captures the remains of the Eastern Empire. Weakened under the continuing schism of the Greek and Latin Christians, the strategically important site of Constantinople becomes an easy target for Sultan Mohammed II much to the consternation and apathy of the West.

The story of the Roman Republic is the greatest epic in human history. Seen in the long perspective of time, it seems too fantastic to be real. From its modest beginnings as a convenient fording place on the Tiber to its eventual destiny as the mistress of the Mediterranean, Rome offers a strange tale of fate, sacrifice, and indomitable willpower. The stern realities of war shaped its policies from the very beginning.