Together the teachings of Charaka, Sushruta and Vagbhatta form the Brhat Tryi, the ‘greater triad’ of surviving texts that are the heart of Ayurvedic literature. Comparatively later texts namely Madhava Nidanam (700 CE), Sarangadhara Samhita (1300 CE) and the Bhava Prakasa Nighantu (1300 CE) form the Laghu Tryi or the ‘lighter triad’. Besides these texts, there are many more highly respected Ayurvedic physicians including Ayurveda Dipika (1100 CE), Bhaishyaja Ratnavali (c.1700 CE) and Yogaratnakara. An important early text is the Kasyapa Samhita, which is concerned with the theory and practice of paediatric and obstetric disease (Kaumara Bhrtya). These later texts not only dealt with disease classifications but also had descriptions of properties of newer drugs introduced in the subcontinent.