Tests showed that the mummy had a pronounced over-bite and misaligned eyes, akin to members of the 19th Dynasty, and his facial measurements were found to be almost identical to those of Ramesses himself.

Experts believe that the mummified man died in his thirties between 1295 and 1186 BC of a wasting disease, likely to be cancer.

Chemical analysis also showed that the body had been embalmed using expensive materials, including pistachio resin and thyme, the preserve of priests and royalty. The story of the royal mummy was uncovered by a team from York University who were filmed carrying out the tests for History Channel series Mummy Forensics.

Gillian Mosely, the producer, said: "When the mummy was taken away for analysis we thought we were looking at a female temple dancer, we certainly didn't expect to make a significant discovery like this. It has been a very exciting and ground-breaking process.

After conducting a series of tests, including a hospital scan, we are 90 per cent sure he is a son of Ramesses, and other evidence suggests he was probably also a priest."

The identity of the mummy, kept at Bolton Museum, Lancs, has been hidden because hieroglyphics on its sarcophagus suggested that it was a female temple dancer.

Historians now believe his body was placed in this coffin years after his death either by a grave robber who stole the original sarcophagus, or it was hidden by people hoping to protect it from thieves.