Kātyāyanīputra ［迦多衍尼子］ (n.d.) (;  Kataennishi): A monk of the Sarvāstivāda school in India around the second century b.c.e. Born to a Brahman family, he later converted to Buddhism. A great scholar, he wrote The Treatise on the Source of Wisdom, a principal doctrinal text of the school, and contributed greatly to the systematization of the school’s doctrine. He is often regarded as the founder of the Sarvāstivāda school.