Marco clearly lost his way home because there's no graph. marco is likely living under a bridge, because that graph is gone... poor marco.... maybe some day they will find him.. but for now... we just have to wait... if only marco had been more responsible with the graph and had included it in his question... (or you're just missing part of the question and it doesn't include a graph)
Like all the various countries all over the world, Rome has its own system of government, which was represented with different form, as republic, dictatorship, Monarchy and Oligarchy. Among the four forms given before, the first in order is the Monarchy, the second is Oligarchy, the third form was republic and at last the dictatorship.
