Given the task definition and input, reply with output. 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.

He was brought up at the estate of Macellum in Cappadocia and as a youth converted to Neoplatonism. Ammianus Marcellinus describes him as a stocky, athletic type, which is confirmed by his statue in the Louvre. He defeated and expelled the Alemanni and the Franks, and was set to take on Constantius II, when Constantius died. After assuming power in 361, he ruled for only twenty months. FTP, identify this nephew of Constantine the Great who gained his nickname when he renounced Christianity and became a pagan.
History