Physiognomy is directly related with astrology and astronomy. A large number of treatises are found in ancient shastras of Hindus on this subject. Prahlada's Samudrika Shastra and Stree Anga Lakshanam are often quoted by physiognomers Poet laureate Maharishi Valmiki has described Shri Rama's physical features in Sundra Kand of Adi Kavya Ramayanam. Samudraraja describes glorious physical features of Maha Vishnu.