Maharaja Jagat Singh I was the ruler of the princely state of Marwar in Rajasthan, India, from 1734 to 1750. He was a member of the Rajput clan and is known for his contributions to the region's architecture and culture. His reign is marked by the construction of several important buildings, including the famous Jaswant Thada. Jagat Singh I was also recognized for his efforts in promoting trade and agriculture in his kingdom. He worked to strengthen the economy of Marwar and improve the welfare of his subjects. His leadership helped maintain stability during a time of political challenges in the region.