The Roman army is one of the most famous fighting forces in history. Through its power and prowess, a once obscure Italian city forged an empire that encircled the Mediterranean and covered half of Europe. The physical remains of its presence can be traced from the mountainous borders of Scotland to the arid deserts of Egypt, but its legacy is far greater and more enduring, as Rome's influence continues to shape the political, legal, and cultural landscape of Europe to this very day.

While the Roman army is rightly famed as an institution, the image of the individual legionary is also an iconic one. The uniformed, disciplined soldier of the late Republic and early Empire is one of the first things many people imagine when they think of Rome. They are the ultimate image of the ancient soldier, their arms and armor instantly recognizable. Their abilities, not only as warriors but also as engineers and administrators, have made them role models for other soldiers through the centuries. In the same vein, their commanders are still celebrated and studied, and generals the world over have tried to emulate the likes of Julius Caesar.

The Byzantine Empire was the heir to two great cultures that cradled and nurtured European civilization: Greece and Rome. Constantinople, now called Istanbul, became a center of power, culture, trade, and technology poised on the edges of Europe and Asia, and its influence was felt not only throughout Europe but the Middle East, Africa, Central Asia, and the Far East. In reality, Byzantium was a strong, organized, highly effective and adaptable civilization for most of its long history. It owed its success in no small part to its military, which, in contrast to the feudal armies of Western Europe and the tribally based forces of the Middle East, operated with a high level of discipline, strategic prowess, efficiency, and organization.