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.

Life among his people was described in the writings of Henry Flynn and Nathaniel Isaacs, two settlers of the Farewell Trading Company that passed through his lands. After his adoptive Mtetwa father was assassinated he gained power by destroying the Langeni. Though the death of his mother, Nandi, caused him to go insane late in his reign and he was eventually killed by his half-brother Dingane, in the early 1820s his standardization of the "assegai" allowed his regiments known as "impi" to dominate Southern Africa. FTP identify this legendary Zulu chieftain.
History