to 12th century. A sculpture similar to Badami, but with some differences, has been discovered in Ajmer (Rajasthan). The Ajmer art work is a free statue where Dattatreya is standing, has one head and four hands. In his various hands, he carries a Trishula of Shiva, a Chakra of Vishnu, a Kamandalu of Brahma, and a rosary common to all three. Like the Badami relief work, the Ajmer iconography of Dattatreya shows the swan of Brahma, the Garuda of Vishnu and the Nandi of Shiva carved on the pedestal with him. Some scholars such as James Harle and TA Gopinatha Rao consider iconography that presents Brahma-Vishnu-Shiva together as Hari Hara Pitamaha to be synonymous with or equivalent to Dattatreya. Antonio Rigopoulos questions this identification, and suggests that Harihara Pitamaha iconography may have been a prelude to and something that evolved into Dattatreya iconography. Symbolism The historic Indian literature has interpreted the representation of Dattatreya symbolically. His three heads are symbols of the Gunas (qualities in Samkhya school of Hinduism). The three Gunas are Sattva, Rajas and Tamas. The six hands have ethical symbolism, namely Yamas, Niyama, Sama, Dama, Daya and Shanti (axiology in Yoga and Vedanta school of Hinduism). The Kamadhenu cow is symbolic Panchabutas, the four dogs are inner forces of a human being: Iccha, Vasana, Asha and Trishna. In these interpretations, Dattatreya is that yogi Guru (teacher) who has perfected all these, rules them rather than is ruled by them, and is thus the Guru Dattatreya is beyond them. Texts The Dattatreya Upanishad (tantra-focussed), Darshana Upanishad (yoga-focussed) and particularly the Avadhuta Upanishad (advaita-focussed) present the philosophy of the Dattatreya tradition. Dattatreya is also mentioned in the classic text on Yoga, the Shandilya Upanishad. Other Upanishads where Dattatreya's name appears in lists of ancient Hindu monks revered for their insights on renunciation are Jabala Upanishad, Naradaparivrajaka Upanishad, Bhikshuka Upanishad and Yajnavalkya Upanishad. Of these, his mention in the Jabala Upanishad is chronologically significant because this ancient text is dated to have been complete between the 3rd century BCE and 3rd century CE. Tripura Rahasya is also an important ancient text attributed to Dattatreya. Dattatreya is mentioned in the Mahabharata and the Ramayana. Dattatreya is mentioned in the ancient chapter 9 of the Sattvata Samhita and chapter 5 of the Ahirbudhnya Samhita, both among the oldest layer of texts in the Vaishnava Agama tradition (Pancaratra). Schrader states these texts and