"Hasht-Bihisht" is a famous poem written by Amir Khusrow around 1302 AD. The poem is based on the Haft Paykar by Nizami, written around 1197 AD, which in turn takes its outline from the earlier epic Shahnameh written by Firdausi around 1010 AD. Like Nizami's Haft Paykar, Khusrow's Hasht Bihisht uses a legend about Bahram V Gur as its frame story and, in the style of One Thousand and One Nights, introduces folktales told by seven princesses. Wikipedia