Explanation:

The exact period of Gwalior Fort's construction is not certain. According to a local legend, the fort was built by a local king named Suraj Sen in 3 CE. He was cured of leprosy, when a sage named Gwalipa offered him the water from a sacred pond, which now lies within the fort. The grateful king constructed a fort, and named it after the sage. The sage bestowed the title Pal ("protector") upon the king, and told him that the fort would remain in his family's possession, as long as they bear this title. 83 descendants of Suraj Sen Pal controlled the fort, but the 84th, named Tej Karan, lost it.