The history of the fort is apparently in question. That most beloved of academic resources, Wikipedia, states: "Like the rest of Agra, the history of Agra Fort prior to Mahmud of Ghazni's invasion is unclear." Mahmud of Ghazni is better known by his regnal name as Mughal emperor, Humayun. Humayun was crowned here in 1530 and we'll meet him again when we return to Delhi.