The earliest reference to this theory is found in the Rigveda. In various Smritis the Kayasthas are found mentioned as judges, high officials and accountants. Kayasthas also founded dynasties and ruled many great Kingdoms. A few of these were:The Great Karkota Dynasty- (Kashmir to western Europe), The Great Lalitaditya Muktapida (697 A.D. to 733 A.D.), Ajatapida (813-850), The Utpala Dynasty- (Kashmir).The  Great Kings of the dynasty were Awantivarman, Shankaravarman (883-902 A. D.) and Chakravarman (922-933 A.D.). Historic cities like Chittor and Chitrakoot were established by Kayasthas.  Pandya Kingdom of South India was established by Kayasthas, all the way to Madurai. Ayodhya, was ruled by Kayasthas before the Raghuvanshies.The Clan Bhanu- Als Khare, ruled the region in between Gandhar/Kandhar (Afghanistan) and Srinagar (India) during Vedic time. The Great Karkota Dynasty and Utpala Dynasty are also considered by scholars to be from this clan.