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.

Late in his reign, this emperor constructed a secret central police force headed by Count Pergen, who also designed the education system under him. Around the same time, in a very sickly condition, this emperor commanded an army that famously confused the word Halt! for Allah! on the eve of battle, resulting in his infantry attacking his cavalry, firing shots in a drunken stupor. His first wife Isabella of Parma died of smallpox long before that blunder in the Battle of Karansebes. His quarrels with Pope Pius VI originated when he attempted to dissolve all contemplative monasteries in his kingdom, though hes better known for issuing the Patent of Religious Toleration and edicts on freedom of the press. For 10 points, name this emperor who also abolished serfdom after succeeding Maria Theresa as Holy Roman Emperor.
History