Order of the Headless

The Headless Monks were a religious order who believed in listening to their hearts rather then their minds, to the point of having themselves beheaded.

History
The Headless Monks were present at Demon's Run when they fought the Eleventh Doctor and his allies. (DW: A Good Man Goes to War) The Delerium Archive was said to be their final resting place. (DW: The Time of Angels)

Behind the scenes

 * The Monks resemble the unnamed cowled figures from TW: Exit Wounds.