History
The identity of the oldest Arabic grammarian is disputed: some sources state that it was ʿAbd Allāh ibn ʾAbī ʾIsḥāq (died AD 735/6, AH 117), while medieval sources say Abu-Aswad al-Du'ali established diacritical marks and vowels for Arabic in the mid-600s. The schools of Basra and Kufa further developed grammatical rules in the late 700s with the rapid rise of Islam.
Read more about this topic: Arabic Grammar