Caliph (The Longest Story in the World)
From Tardis Wiki, the free Doctor Who reference
The Caliph was a man of high royalty, who ordered a woman the task of entertaining him and his court with a story. If the woman did not entertain them, she would die. Her life was spared when she told the Caliph a story of an old man and his grand-daughter (ST: The Longest Story in the World )
