Samuel Douglas, 3rd Marquess of Queensberry

Stories describe him as an "imbecile" and violently insane. He was kept under lock and key from childhood at Queensberry House in Edinburgh, now part of the Scottish Parliament complex.

It is reported that when the Act of Union was signed in 1707, the disruption from either the festivities or the riots resulted in his escape. Drumlanrig, then around 10 years old, slaughtered a servant in the house's kitchen, roasting him alive on a spit, and began to eat him before he was discovered and apprehended.[1][2][3] He was afterwards known as 'The Cannibalistic Idiot'. The oven that he used can be seen in a room in the basement of Queensberry House, which housed the Parliament's Allowances Office until 2012, when it became a private bar for MSPs and their guests.