Islam

Islam was one of the major religions of Earth. During the Crusades, Muslims, particularly the ones who fought in the conflict, were referred to as Saracens.

King Richard I of England fought Saracens in the Crusades, at one point aided by the First Doctor, Ian Chesterton, Barbara Wright and Vicki. (DW: The Crusade)

In 1240, Bishop Vasil hoped to form an alliance with the Mongols to fight against the forces of Islam. (PDA: Bunker Soldiers)

Rita was a Muslim, and believed the Prison Ship to be Jahannam. (DW: The God Complex)