During Mandalika I's reign, in 1299 CE, Gujarat was conquered by Ulugh Khan and Nusrat Khan Jalesari, the generals of Delhi Sultan Alauddin Khalji. Ulugh Khan also destroyed Somnath temple which had been rebuilt since the time of destruction by Mahmud of Ghazni in the 11th century. He also conquered the sea coast of the peninsula from Ghogha to Madhavapur. On this occasion, Mandalika is said to have defeated a division of his troops but possibly he may have defeated one of the governors of the sea coast left by Ulugh Khan. The Revati Kund inscription near Damodar Kund, Junagadh (VS 1472/1417 CE) mentions him as conqueror of the Mudgalas (Muslims). The inscription at the Neminath Temple (c. VS 1510/c. 1454 CE) on Girnar mentions that he had adorned the Neminath temple with gold plates. Mandalika I was succeeded by his son Navaghana.