 But, after hearing the news of the death of his two sons and the plunder of his capital, he was so shocked that only after a few days' illness he died at Kahalgaon in 1539 A.D., where his tomb was built later.The tomb of Mahmud Shah is, therefore, of great historical significance.Bhagalpur is famous for high quality silk products, the industry is more than 100 years old with traditional clans of silk producers and weavers living here.