The main frame story concerns Shahryār, a king who ruled an empire that stretched from Persia to India.[8] The story begins with Zaman, the brother of Shahryār, setting out on a journey to visit his brother at his palace. Early in the preparations, he remembers that he's left something inside his own palace, and returns to retrieve it—only to find that his wife has been making love to a black cook in their own bed. He kills them both, and continues on his journey, keeping the event a secret. Then Shahryār finds that his own wife, as well as his numerous slave girls, have been engaging in secret orgies with black men.[9]

(http://www.autoadmit.com/thread.php?thread_id=5873772&forum_id=2Reputation#49935498)