وقعة صفين
Great diversity of opinion exists about his name, surname and genealogy. He lived in Basra and was intelligent, sagacious, and one of the most eminent Tābīs (inhabitants of Basra). He fought at the Battle of Siffin under Ali ibn Abi Talib and he invented grammar. Ali laid down the principle of the three parts of speech; the noun, the verb and the particle and told him to write a treatise on it. He was said to be tutor to the children of the governor of Arabian and Persian Iraq, Ziyad ibn Abih.