Tarikh-i saʿadat-i jawid 3: Maharaja Jai Singh Sawai, of the Kachhwaha tribe.

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His ancestors have been from ancient times the Rajas of Amber. Amongst them was Raja Bhara Mal, whose son was Raja Bhagwan Das, and Raja Man Singh was the eldest son of that Raja. These, in the time of the Emperor Akbar, were raised to the dignity of Amiru-l umara or generals of the army. With a view to strengthening the foundation of his government, Akbar connected himself by marriage with this family. They rendered valuable services and performed great exploits, which are narrated in the histories of Hindustan. Maharaja Jai Singh was very generous, kind, wise and brave. After his death, thirty krors of rupees were reckoned to have been given by him in charity and rewards. He performed the sacrifice of a horse according to the well-known Hindu custom.
The city of Jainagar is a monument of his greatness. After his death, Muhammad Shah granted a khil'at to his son Raja Isri Singh, confirming him in his hereditary dominions. This Prince, in the battle fought against Ahmad Shah Durrani, fled from Sirhind, and went to his country as has been before related. The descendants of Raja Jai Singh Sawai are still in possession of their hereditary dominions, and maintain great state. As the lamp of Dehli has been long since extinguished, and the Dakhinis (Mahrattas) have taken possession of most of the cities of Hindustan, and the Rajas of Joudhpur, Udipur and other Chiefs of Marwar have become weak, and pass their days as if they were nights; so also the Rajas of Jainagar pay a fixed annual tribute to the Dakhinis and enjoy a state of peace.