Patañjali (Devanāgarī पतञ्जलि) (fl. 150 BCE or 2nd c. BCE) is the compiler of the Yoga Sutras, an important collection of aphorisms on Yogapractice, and also the author of the Mahābhāṣya, a major commentary on Pāṇini's Ashtadhyayi. However, it is unlikely that these two works are that of the same author.
In recent decades the Yoga Sutra has become quite popular worldwide for the precepts regarding practice of Raja Yoga and its philosophical basis. "Yoga" in traditional Hinduism involves inner contemplation, a rigorous system of meditation practice, ethics, metaphysics, and devotion to Brahman. At the same time, his Mahābhāṣya, which first foregrounded the notion of meaning as referring to categorization, remains an important treatise in Sanskrit linguistic philosophy.