Calling himself Thelonios, he used the illuminated art skills of the other monks to create a circuit to repair his TARDIS.
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The Monk liked to meddle in history and to change it for his own amusement and for what he considered to be the better: lending mechanical assistance to the builders of Stonehenge; giving Leonardo da Vinci tips on aircraft design; making money by using time travel to exploit compound interest; and, when the Doctor first encountered him, attempting to prevent the Norman Conquest as part of a plan to guide England into an early age of technological prosperity.
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