Mahabhashya (Sanskrit: महाभाष्य, IAST: Mahābhāṣya, IPA: [mɐɦaːbʱaːʂjɐ], "Great Commentary"), attributed to Patañjali, is a commentary on selected rules of Sanskrit grammar from Pāṇini's treatise, the Aṣṭādhyāyī, as well as Kātyāyana's Vārttika-sūtra, an elaboration of Pāṇini's grammar. It is dated to the 2nd century BCE on the basis of records of Yijing, the Chinese traveller who resided in India for 16 years and studied in Nalanda University.[1][2]