The Turk was a machine created in the 18th century. It took the form and, apparently, mind of a human. The grand masters of Europe could play chess against the machine. (EDA: The Adventuress of Henrietta Street)
Percy Shelley invested money in it prior to 1816. (BFA: The Silver Turk)
Behind the scenes
The Turk served as inspiration for Russell T Davies in devising the Clockwork Droids that appeared in 2006's The Girl in the Fireplace. The title of upcoming Big Finish Productions drama The Silver Turk, also refers to the machine.