Sibawayh was a prominent Persian linguist and grammarian, born in the 8th century. He is best known for his foundational work in Arabic grammar, particularly through his book, Al-Kitab, which systematically outlined the rules of the Arabic language. His contributions laid the groundwork for future studies in Arabic linguistics. Sibawayh's influence extended beyond his lifetime, shaping the way Arabic was taught and understood. His methods emphasized the importance of both spoken and written forms of the language, making his work essential for scholars and students of Arabic. His legacy continues to be recognized in the field of linguistics today.