 काव्यं रामायणं कृत्स्नं सीतायाश्चरितं महत्।पौलस्त्यवधमित्येव चकार चरितव्रत:।।  
 Valmiki who practised religious austerities composed this entire epic named the Ramayana which constitutes the great history of Sita and the killing of Paulastya Ravana.  