The history of the Roman Empire is the history of one of the largest and most enduring multiethnic states in the history of the world, making it an area of study that continues to have great relevance to the modern world. Principal areas of investigation for those drawn to the study of the Roman Empire include the development of institutions needed to govern such a state, the behavior of those institutions, the dialogue of cultures within the empire (especially issues of assimilation, resistance, and evolution between dominant and subaltern groups), and the relationship between Rome and its neighbors. It is also a period that saw significant developments in art, literature, and the history of thought, shaping the heritage of classical Antiquity that has survived through the Middle Ages to help shape the Western tradition of rational thought. It is also a very colorful period, whose leading figures, ranging from Marcus Aurelius and Jesus of Nazareth to Nero and Commodus, continue to excite great interest for their own sake.