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Knight was the term for a social position originating in the Middle Ages denoted by the prefix "Sir" in front of the recipient's given name. They were bound to a code of honour, holding their word as their bond. (TV: The Crusade) The title was only bestowed upon those in the service of the monarch, or who had become favoured in their sights. (TV: Tooth and Claw) Sir Robert de Wensley believed that all good knights served "the king in heaven". (AUDIO: The Doctor's Tale)
In the UK Edit
Both the Fifth and Tenth Doctors were knighted by King John (in reality the android Kamelion) and Queen Victoria respectively. The latter also bestowed the title of "Dame" upon Rose Tyler. (TV: The King's Demons, Tooth and Claw) Brigadier Alistair Gordon Lethbridge-Stewart was knighted by Queen Elizabeth II. (TV: The Poison Sky, PROSE: The Dying Days)
During the crusades, knights were the primary leaders of the English forces. While fighting Saladin, Richard I of England was frequently surrounded by knights whom he held in high regard. He knighted Ian Chesterton while in Palestine. (TV: The Crusade)