Trajan summary

Emperor, title designating the sovereign of an empire, conferred originally on rulers of the ancient Roman Empire and on various later European rulers, though the term is also applied descriptively to some non-European monarchs. In republican Rome (c. 509–27 bce), imperator denoted a victorious

Army, a large organized armed force trained for war, especially on land. The term may be applied to a large unit organized for independent action, or it may be applied to a nation’s or ruler’s complete military organization for land warfare. Throughout history, the character and organization of

Imperialism, state policy, practice, or advocacy of extending power and dominion, especially by direct territorial acquisition or by gaining political and economic control of other areas. Because it always involves the use of power, whether military or economic or some subtler form, imperialism has

War, in the popular sense, a conflict between political groups involving hostilities of considerable duration and magnitude. In the usage of social science, certain qualifications are added. Sociologists usually apply the term to such conflicts only if they are initiated and conducted in accordance