Assuming the northern frontier was in Britain around Hadrian's Wall, the Romans called the Picts and the other tribes Caladonians.
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The biggest concerns of the Romans were protecting the vast frontiers of their empire from invasions and maintaining internal stability.
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The apostles spread the message in key areas of the empire and converted people.
Charlemagne's empire included nearly all of modern France, but not Brittany. It included northern Spain, in the area of the Pyrenees known as the Spanish March. It included Belgium and the Netherlands, most of what was West Germany, Switzerland, most of Austria, and parts of northern Italy, including Lombardy and Tuscany. In addition to this, areas extending for about three hundred kilometers east were very likely to be tributaries of the empire. The Empire of the West, as Charlemagne's empire was called, gave rise to the nation of France and the Holy Roman Empire.
Western Roman Empire and Eastern Roman Empire are terms which have been coined by historians. The Romans did not have them and used only one term: Roman Empire. Historian use the term to indicate the western and eastern part of the Roman Empire. Emperor Diocletian created a co-emperorship with fellow general Maximian in 286. Diocletian was in charge of the east and Maximian was in charge of the west. Nicomedia (in northwestern Turkey) was designated the imperial capital for the east and Milan was designated the imperial capital for the west. This was not a splitting of the Roman Empire. It was an administrative arrangement designed to improve the defence vast frontiers of the empire. The western part of the empire included the Roman possessions in western Europe, including Britain, and Africa (Northern Morocco, coastal Algeria, Tunisia and western coastal Libya). The eastern part included southeastern Europe (the Balkan Peninsula) the possessions in Asia (Turkey, Syria, Lebanon, Palestine, Jordan and the northern part of the coast on the red Sea of Saudi Arabia), Egypt and eastern coastal Libya. Emperor Constantine the great moved the capital of the east from Nicomedia to the nearby Byzantium, which he redeveloped and renamed Constantinople in 330.