The remains, which bear the hallmarks of having been hanged, drawn and quartered, are thought to be those of Sir Hugh Despenser the Younger, who was executed as a traitor in 1326.

	Sir Hugh was executed after Edward II was deposed from the throne in 1326

Sir Hugh had been favourite of Edward II - who was widely believed to have been homosexual - but was brutally executed before a mob after the king was ousted from the throne.

The decapitated remains, buried at Hulton Abbey, Staffs, have intrigued experts since they were uncovered during the 1970s and now Mary Lewis, an anthropologist, says she has uncovered compelling evidence of their true identity.

The manner of execution, carbon-dating of the bones, and the absence of several parts of the body all point towards Sir Hugh being the victim, she said.

"If the remains are those of Sir Hugh Despenser the Younger, then this is the first time such an execution victim has been identified," she added.

Sir Hugh insinuated himself into the king's favour by backing him in his battles with the barons. Through a series of ruthless deals, he consolidated a huge fortune, winning himself a legion of enemies in the process, including Edward's wife, Queen Isabella.

His downfall came when the queen and her ally, Roger Mortimer, deposed the king in 1326.

Sir Hugh was judged a traitor and a thief. He was hanged and, still conscious, castrated, disembowelled and then quartered before his head was displayed on London Bridge.

Miss Lewis, a biological anthropologist at the University of Reading, found that the Staffordshire skeleton had been beheaded and chopped into several pieces with a sharp blade, suggesting a ritual killing.

There was also evidence of a stab wound to the stomach.

She said: "This form of public execution was high theatre that aimed to demonstrate the power of government to the masses. High treason dictated that the perpetrator should suffer more than one death."