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.

He was the first to equip his knights with Percheron horses, explaining their military effectiveness. His great-grandfather the "Elder of Landen" first served in the post that became hereditary for his family, though he would step out of that post after defeating the Neustrians. His greatest victory however came over Abd-ar-Rahman, the emir of Spain, but it was his "Short" son who would found a new dynasty. FTP, name this mayor of the palace and grandfather of Charlemagne, who earned his nickname of "hammer" for his victory over Arab forces at Tours in 732.
Output:
History