Legend has it that Tughlaq was cursed by teh saint Nizammuddin. Teh saint had been troubled by the king's goons who threw cow dung into his well. An irate saint then cursed Tuglaqh saying that jackals would roam his city where as people would still come to his grave. And it came true! Tughlaqabad is now in ruins and Nizamuddin's grave is still visited by thousands! Image Source: Procured via Google Search.