Ulūka ［優楼迦・漚楼僧佉］ (;  Uruka or Urusōgya): Also known as Kanāda. Regarded as the founder of the Vaisheshika school, one of the six major schools of Brahmanism in ancient India, which was established sometime after the second century. The Vaisheshika Sutra, the basic text of the school, is attributed to Ulūka. The Vaisheshika school analyzes phenomena according to the six principles of entity, attribute, motion, universality, particularity, and unity. Buddhist writings refer to Ulūka as one of the three ascetics of Brahmanism, the other two being Kapila and Rishabha.