Jaisalmer Fort is one of the largest fortifications in the world, was built in 1156 AD by the Rajput ruler Rawal Jaisal, from whom it derives its name. The fort stands amidst the sandy expanse of the great Thar Desert, on Trikuta Hill, and has been the scene of many battles. Its massive yellow sandstone walls are a tawny lion colour during the day, fading to honey-gold as the sun sets, thereby camouflaging the fort in the yellow desert. For this reason, it is also known as the SonarQuila or Golden Fort.