What is "sibawayh"

Abū Bishr ʿAmr ibn ʿUthmān ibn Qanbar Al-Baṣrī (c. 760–796, ), commonly known as Sībawayh (; Arabized form of the Middle Persian name Sēbōē), was an influential linguist and grammarian of Arabic. His seminal work, Al-Kitab, was the first written grammar of the language. Despite his significance to the development of the Arabic language and linguistic tradition, Sibawayh was an ethnic Persian and wasn't a native speaker of Arabic, having learned the language later in life. He has been referred to as the greatest of all Arabic linguists and one of the greatest linguists of all time in any language.