Kashi Prasad Jayaswal
Kashi Prasad Jayaswal (1881 – 1937) (also K.P. Jayaswal) (काशी प्रसाद जायसवाल) was an Indian historian and lawyer. Jayaswal's works 'Hindu Polity' (1918) and 'History of India, 150 A.D. to 350 A.D.' (1933) are classics of ancient Indian historical literature.
Birth and Education
Jayaswal was born in Mirzapur, Uttar Pradesh, and graduated from Allahabad University.He went on to Jesus College, Oxford University, where he was awarded the Davis Scholarship in Chinese and graduated with a M.A. in Ancient Indian History in 1909. He was called to the Bar of Lincoln's Inn in London in 1910. After returning to India, Jayaswal set up practice at the Calcutta High Court, where he came into contact with Sir Ashutosh Mukherjee, who inspired Jayaswal to undertake further research in ancient Indian history. Jayaswal moved to Patna in 1916, and remained there permanently.
Jayaswal wrote more than 120 research papers in addition to 11 books and numerous commentaries and translations. He also played a pioneering role in excavating and restoring ancient sites, including the university of Nalanda in modern Bihar. He was also an expert in Numismatics, and his discovery of several coins of the Maurya and Gupta periods led to his being the first Indian to be invited to speak at the Royal Asiatic Society of London in 1931. Jayaswal was twice elected president of the Numismatic Society of India, and was awarded the degree of Doctor of Philosophy (Honoris Cause) by Benares Hindu University and Patna University.
The K.P. Jayaswal Research Institute in Patna was established by the Government of Bihar in 1950 with the object of promoting "historical research, archaeological excavation and investigations and publication of works of permanent value to scholars".
On Jat History
- Panwar - According to ‘Panwar Darpan’ prior to Vikramaditya was king Dharagiri who founded Dara (Dharagiri) near Damiscus who were Malav descends.  James Todd has written that Parmaras (Panwar) rulers of Arbud (Abu) were Jat (vansha). 
- Rathi: The name Saurastra is known after them, as per K P Jayaswal. Arthashastra mentions Surastra as well as their Rastrika government. In Asoka’s inscriptions they are mentioned as Rastikas, in the Girnar, Rathikas in the Shah Bazgarhi, and Rathakas in the Mansehra inscription (For the use of the word Rathika, see Barua’s Old Brahmi Inscription). 
- Tewatia - There are observations of late Dr. K P Jayaswal about Tewatias. His reading of the name, Tubathi is practically correct it should be tevathi / Tuvathi but it is not place name it is a clan name of the Jats. The symbols of water (with fish) and earth (with tree) are the tradition symbols of the Jats (Dharti-Pani in Hindi) It is perhaps, older than Mauryan times. Tabiti is the name of the fire goddess of the Scythians. If these suppositions are correct then it shows that the Tevathiya Jats came to India during Achaemenid disturbance.  
Guptas were Jats of Dharan gotra
The Guptas of Gupta Empire have been proved by historians to be Dharan Jats. The Arya Manjushri Mul kalpa, is a history of India covering the period 700 BCE to 770 AD. The history was a Buddhist Mahayana work, by a Tibetan scholar, and was composed sometime in the 8th century CE.
K P Jayaswal brought this material out from above book in his eminently scholarly book :An Imperial history of India C 700 BC – C 770 AD. K P Jayaswal has spotted and brought out the fact that the second Guptas, (Chandra Gupta II, Samudra Gupta etc circa 200 BCE to 600 BCE) were Jats, who came originally form the Mathura area. They were of the Dharan Gotra, as shown by the Plate inscription of the Prabhavatigupta , where she gives her father’s (and her) Gotra as Dharan. The Dharan Jats still can be found in the U.P. Mathura region and they proudly point to their ancient glory, of how their forefathers ruled Hindustan.
According to him Gupta is said to have been a Mathura-Jata (Sanskrit- Jata-vamsa). Jata-vamsa, that is, Jata Dynasty stands for Jarta, that is, Jat. That the Guptas were Jat; we already have good reasons to hold (JBORS, XIX. p. 1U). His Vaisali mother is the Lichchhavi lady.
Here is produced point wise account from a famous historian K.P. Jayaswal's book, History of India, PP 115-16 :
- That nowhere Guptas disclose their origin or Caste status. That their caste sub-division was Dharan. Since Prabhavati Gupta daughter of Chandra Gupta II and queen of Rudrasen II Vakataka in her copper plate grant of Pune has shown sub-caste of her family (Gupta) as Dharan (EI XV-41 P-42).
- The Salvas were a branch of the Madras and were ruling at Sialkot. These Madras had a branch named Kuninda, who were related to Koliya Naga.
- Karaskars were thus a Punjabi people a sub-division of the Madras. We know that the Madras were Vahikas and Jartas. This community, thus, consisted of several sub-divisions.
- Since according to grammatical illustration of Chandra-gomin the Jarta defeated the Huns, which means Skanda Gupta defeated the Huns. Hence Guptas were Jartas or Jat.
- Jayaswal, Prashant Kumar: Shaka kalin Bharata page 5
- Encyclopedea of Archives (Ghos Memorial) Volume 11 page 733
- Bhim Singh Dahiya, Jats the Ancient Rulers ( A clan study), p. 268
- Rowlinson’s Herodotus, Vol. III, p. 160
- Bhim Singh Dahiya : Jats the Ancient Rulers ( A clan study), 1980, Sterling Publishers New Delhi, 276
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