Nagarjuni was an influential Indian philosopher and Buddhist monk who lived around the 2nd century CE. He is best known for founding the Madhyamaka school of Mahayana Buddhism, which emphasizes the concept of emptiness and the middle way between existence and non-existence. His teachings have had a profound impact on Buddhist thought and practice. Nagarjuni is also credited with writing several important texts, including the Mulamadhyamakakarika, which outlines his philosophical ideas. His work has been studied and revered by scholars and practitioners of Buddhism throughout history, making him a central figure in the development of Buddhist philosophy.