Nathawat is a sub clan of Kachwaha

Kachwaha

Kachwaha are a Suryavanshi Kshatriya clan who ruled a number of kingdoms and princely states in India such as Alwar, Maihar, Talcher, while the largest kingdom was Jaipur which was founded by Maharaja Sawai Jai Singh II in 1727...

 Rajput

Rajput

A Rajput is a member of one of the patrilineal clans of western, central, northern India and in some parts of Pakistan. Rajputs are descendants of one of the major ruling warrior classes in the Indian subcontinent, particularly North India...

s included in Bara Kothri. Natha was a great warrior. He was the son of Gopal, who was the son of Raja Prithviraj of Amber, India. Gopal was given the jagir

Jagir

In historic India, a jagir was a small territory granted by the ruler to an army chieftain in fairly short terms usually of three years but not extending beyond his lifetime, in recognition of his military service...

 (fief) of Chomu

Chomu

Chomu is a city and a municipality in Jaipur district in the state of Rajasthan, India.-Geography:Chomu is located at .It is 33 km far in north from Jaipur . Chomu is having a good tourist and filmmakers destination in its nearby village named Samod. It has also a good class of hotels such as...

 and Samode. His descendants are called Nathawats. Raisar, Choumu, Samode, Mundota, Kalwara(कलवाडा), Morija, Ajayrajpura, Baghawas and ChotiDungari and Bhoorthal were their main Thikanas.
The five colored Jaipur flag was won by Nathawats after defeating five kings of Afghanistan and was presented to the ruling king, Raja Man Singh, who in turn gifted them the white flag of Kachchawas.