Mahendra Dayashankar Gor Sūri is the 14th century Jain astronomer who wrote the Yantraraja, the first Indian treatise on the astrolabe. He was a pupil of Madana Suri. His father was Dayashankar and mother was Vimla. Dayashankar and Vimla had eight children, four sons and four daughters. Mahendra married a woman by the name of Urmila and had four daughters.