The Riddles of Amir Khusrow were developed during the royal courts of more than seven rulers of the Delhi Sultanate. During this time, Khusrow wrote not only many playful riddles, but songs and legends which have been a part of popular culture in South Asia ever since. Additionally, his riddles and songs and legends are considered to be an important early witness to the Hindustani language. His riddles in particular involve fun double entendre or, wordplay. Innumerable riddles by this poet are being passed through oral tradition for the past seven centuries with a notable increase in recent times. However, there is some debate about whether Khusrow was the real author of the riddles attributed to him; some riddles transmitted under his name concern subjects which did not exist in Khusrow's own time, such as the gun and hookah.