Al-Mutawakkil
From Tardis Wiki, the free Doctor Who reference
Caliph Al-Mutawakkil was the ruler of the Caliphate of Baghdad in the 9th century. The White Guardian was employed as his legate, and was sent to collect the tax from Dunqulah, which was ruled by the Black Guardian. The two guardians had been confined to just five dimensions as an effect of the segments of the Key to Time decaying. (AUDIO: The Destroyer of Delights)
