The correct answer is Sawai Jai Singh.
- Sawai Jai Singh translated the Euclid text 'Elements of Geometry in Sanskrit'.
- He was the son of Vishnu Singh.
- The Mughal emperor Aurangzeb gave him the title of Sawai.
- He gave his support to the Mughal emperor Azam in the Jajau war.
- He participated in the Debari Pact.
- He built Jantar Mantar in Jaipur in 1728 AD.
- He founded the city of Jaipur in 1727 AD.
- He defeated Abhay Singh of Marwar in the Gangwana battle in 1741 AD.
- Jai Singh Karika text was written by himself.
Key Points
Jantar Mantar

Additional Information
- Ishwari Singh-
- He was the son of Sawai Jai Singh, who became the ruler in 1743 AD.
- According to the Debari agreement, Madho Singh was about to become the first king, so Madho Singh revolted against Ishwari Singh.
- He fought the battle of Rajmahal against his brother Madho Singh I in 1747 AD and defeated Madho Singh, on this occasion he built Sargasuli (Isherlat) in Jaipur.
- He also fought the battle of Bagru with Madho Singh I, Malhar Rao Holkar, Umaid Singh, and Durjan Shal in August 1747 AD and lost this battle.
- He defeated the army of Ahmad Shah Abdali in the Manpur war in 1748 AD.
- He committed suicide by jumping from Isherlat in 1750 AD along with his three queens.
- Mansingh I-
- He was the son of Bhagwantdas.
- His first coronation was happened in Patna, while his second coronation happened in Amer.
- He was one of the Navratans of Akbar.
- The Mughal emperor Akbar gave him the titles of Farzand and Raja.
- He also received seven thousand Mansabdari from the Akbar.
- He firstly went for the Ranthambhore campaign in 1569 AD with Akbar.
- He was the chief commander of Akbar in the Haldighati battle.
- Jagat Singh II-
- He became ruler after Sawai Pratap Singh.
- He fought the Gingoli battle with the Jodhpur state due to the Krishna kumari marriage dispute.
- He did a treaty with the East India Company in 1818 AD.