Historical references about the Kullu valley dates back to ancient Hindu literary works of Ramayana, Mahabharata and the Puranas. During Vedic period several small republics known as "Janapada" existed which were later conquered by the Nanda Empire, Mauryan Empire, Gupta Empire, Pala Dynasty and Karkoṭa Empire. After a brief period of supremacy by King Harshavardhana, the region was once again divided into several local powers headed by chieftains, including some Rajput principalities, these principalities were later conquered by Maratha Empire and Sikh Empire.