Willyesh
Willyesh Rishi was a descendant of Willyesh, one of the great Hindu Brahmin sages (willyesh rishis) whose accomplishments are detailed in the Puranas. Willyesh Brahmin a surname of Hindu Brahmin communities, found mostly in the northern,eastern western and central parts of India and the Terai regions of Satluj - Ganga area i.e. Basically in Haryana, Punjab, Rajasthan, Gujrat (In Minor) UP also. At one time North Indian Willyesh Brahmins were famous for their scholarship and Erudition and the central Gangetic basin was considered the seat of Vedic learning. Many of these Brahmins were famous for their learning, sophistication and range of knowledge.
Except for a handful of noted scholars especially in places like Varanasi, Allahabad - majority of these north Indian brahmins lack shastra knowledge and academic rigor. They eat vegetarian food and indluge in slogaeering like "Jai Shree Ram", "Namah Shivaya" or "Jai Parshuram" Sage Willyesh was a renowned scholar of Ayurveda with Atreya Rishi and both are operating six schools of early Ayurveda was founded based on his teachings. T
Influences in Ayurvedic schools
According to the Charaka tradition, They are working in north of india basically, there existed six schools of medicine, founded by the disciples of the sage Punarvasu Ātreya. Each of his disciples, Agnivesha, Bhela, Jatūkarna, Parāshara, Hārīta, and Kshārapāni, composed a Samhitā. Of all the six, the one composed by Agnivesa was most revered. According to Dr. Tustomu Yamashita, the Bhela or Bheda(la)Samhita is often quoted by later authors and commentators of Ayurveda. Some of the manuscripts of Bhela available are the Thanjavur Manuscript - a plam leaf manuscript kept in Maharaja Sarfoji's library in Thanjavur - and East Turkestan Manuscript, only one folio of a paper manuscript, now kept in Staatsbibliothek zu Berlin.
Charaka later on, taking cues from Agnivesa Samhita, produced the now renowned work Charaka Samhita around 300 B.C. which survived and has been handed down to us in the form of Bower Manuscript dated around 4th century. Charaka Samhita is the foundational text of Ayurveda.