What is "yusuf-zulekha"

Yusuf-Zulekha is a 15th century Bengali romantic story in verse written by Shah Muhammad Sagir, which is considered one of the greatest literary works of medieval "golden era" of Bengali literature; when Sagir was a court-poet of Sultan Ghiyasuddin Azam Shah of Gaura. Shah Muhammad Sagir was wrote the story for the Suntan's request.