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Jaisalmer(jəsäl`mər), former principality, Rajasthan state, NW India. Its terrain is largely a sandy or stony waste and constitutes a section of the Thar Desert. Jaisalmer was brought under the Mughal empire by AkbarAkbar
, 1542–1605, Mughal emperor of India (1556–1605); son of Humayun, grandson of Babur. He succeeded to the throne under a regent, Bairam Khan, who rendered loyal service in expanding and consolidating the Mughal domains before he was summarily dismissed (1560) by
..... Click the link for more information. in 1570. It became a British protectorate in 1818. In 1949 the region was incorporated into Rajasthan state. The town of Jaisalmer was the capital of the former state. Now a rail terminus and strategic military post close to the Pakistan border, the town is noted for its massive yellow sandstone fort.