Sibawayh (148 AH - 180 AH / 765 - 796 AD) Amr bin Othman bin Qanbar al-Harithi, nicknamed Abu Bishr, nicknamed Sibawayh: the imam of grammarians, and the first to simplify the science of grammar. He took grammar and literature from Al-Khalil bin Ahmed Al-Farahidi, Yunus bin Habib, Abu Al-Khattab Al-Akhfash and Issa bin Omar, and Baghdad was reported, and Al-Kisa’i looked at it, and they were intolerant of him, and they made the Arabs a position until they agreed with him to disagree with him. Among its effects: Sibawayh's book on grammar.