The document discusses the three major ancient Ayurvedic texts known as the Bhruhatrayee - the Charaka Samhita, Sushruta Samhita, and Vagbhata Samhita. It provides background information on the authors of each text - Charaka, Sushrutha, and Vagbhata respectively. For each author, it discusses what is known about their life and times based on references in other ancient Indian texts, the structure and content of their major works, and important commentaries written on them.