This is the complete and unabridged collection of all six volumes from The Decline and Fall of the Roman Empire. 

The Decline and Fall of the Roman Empire by Edward Gibbon (an English historian) is a six-volume collection that examines the fate of one of the most renowned civilizations in history, the Roman Empire. This historical account by Gibbon is widely considered by many as one of the greatest works of history ever written. In this masterpiece, Gibbon covers the time periods from the second century A.D. to the 15th century, and takes a look at the history of early Christianity along with the Roman State church, the history of Europe and the Middle East along with the rise of Islam, and the events that lead to the collapse of the Roman Empire among many other historical events.