The Vishwakarmas, aka the Kammalars, are a community of metalworkers and craftsmen. Many people consider them to be low-caste, but they claim that they're actually Brahmanas, descended from the divine architect Vishwakarma, aka Tvashta. In any case, this excerpt from the Journal of the Andhra Historical Research Society quotes a work by the Vishwakarmas, where they justify their claims of Brahmana heritage by referring to an incident involving Adi Shankaracharya:
The name "Jagadguru" teacher of the world, the teacher of the world is a distinction to which the people of Vishvakarma Caste alone are entitled (Wilson Dictionary). When the world-famous Shankaracharya of Travancore, the founder of the Avaita School of Philosophy ... halted at Masulipatam he styled himself "Jagadguru". The Devakammalars of South India, who were very jealous of their title were incensed at an apparent impostor trying to assume what was their own exclusive propert, questioned his right to the distinction, when the philosopher sang the following lines:
"Acharya Sankaro nama
"Twashta putro nasanyasa,
"My name is Shankaracharya, I am a descendant of Twashtar, I have come here to teach the Vipras the right of wearing the sacred thread, I am a Brahmana of the Vishvakarma Caste." (Shankaracharya Vijaya)
This is irrefutable proof that the people of the Vishvakarma Caste are Brahmans.
Whether it's irrefutable is another matter, but my question is, which Shankara Vijaya does this quote come from? For those who don't know, the Shankara Vijayas are the traditional biographies of Adi Shankaracharya. The most famous one is the Madhaviya Shankara Digvijaya, but that doesn't seem to have the quote I'm looking for.
By the way, assuming that Adi Shankaracharya is a Vishwakarma Brahmana, what would his Gotra Pravara be? As I discuss in my question and answer here, Vishwakarma had a three-headed son named Trisiras who was killed by Indra. Was Adi Shankaracharya a descendant of Trisiras?
Also, other people believe Adi Shankaracharya was a Namboothiri Brahmana. So what do they believe about Adi Shankaracharya's Gotra?