Oman Power. In the latter part of the fourth century and the first half of the fifth century the Huns fill the pages of Bulgarian history. Then came the Slavs; and then, in the seventh century, the Bulgars, almost certainly a Hun tribe, but Huns modified by two centuries of time. But the death of Valens may be said to have ended the Roman Empire as a World Power. Let us retrace our steps a little and give the chief facts as to how a Bulgarian Empire for a time--a very short time--replaced the Roman Empire over a great area of the Balkan Peninsula. CHAPTER III THE SCRAP-HEAP OF RACES The historian, rightly, must always march under a banner inscribed "Why?" The facts of history bring no real informing to the human mind unless they can be traced to their causes, and thus a chain of events followed link by link to see why some happening was so fruitful in results, and to search for the relation of apparently isolated and accident