Routine tests run on blood donated by Bob Goddard suggest that the Englishman has some exotic ancestry.
The 64-year-old's rare combination of blood groups has revealed he could be related to the last Sikh royal family, who once owned the Koh-i-noor diamond.
Further research into Mr Goddard's family tree has shown that his great grandfather may have been Prince Freddy, second son of Maharajah Duleep Singh, known as the "last king of the Sikhs".
Mr Goddard said he discovered that his grandfather, Charlie Goddard, who was born in 1888, was the illegitimate son of an unmarried serving maid at Breckles Hall in Norfolk.
"She would never reveal the father's identity, but it was rumoured he was an Indian prince who stayed there," he added. [Link]