You will be given a definition of a task first, then some input of the task.
In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

One ruler of this polity diluted his power by placing his brother Pacorus in control of a region of Atropatene and attempted to the found the anti-Greek town of Vologesias. An earlier king of this empire may have partially ruled with his son, also named Pacorus, and killed his father before the latter could respond to the occupation of Orsoene and Gordyene. That king, Orodes II, also put to death, the victorious general in a battle over Gaius Cassius Longinus and others. Its first capital was likely centered at Dara, and this polity's rule was ended by Ardashir I. Before that, one king of this polity defeated Artavases of Armenia but was himself defeated by the Scythians; that man was Mithridates the Great. Defeating Marcus Licinius Crassus at the battle of Carrhae, for 10 points, name this Mesopotamian empire, a rival of Rome.
Output:
History