Prince Harry's girlfriend Cressida Bonas is related to his mother Princess Diana, making the couple distant cousins, a media report said today.
The finding by geneologists, which comes just days after Bonas's ancestry was linked to Sir Winston Churchill, was made as millions of records pre-dating the census were published online for the first time, The Sunday Times reported.
More than 11 million documents, known as the 'Tithe Records', provide details of ownership and occupancy of land in England and Wales dating from 1836 to 1930, when they were phased out.
The documents can now be found on a website after being published in partnership with the National Archives, the report said.
Online searches have allowed experts to trace the ancestors of well-known figures including Harriet Harman, John Cleese, Eddie Izzard and Justin Welby, the Archbishop of Canterbury.
However, one of the biggest surprises came when researchers confirmed that Bonas, 25, was a blood relation of Harry through the Spencer line on his mother's side.
"Our software worked out they are fourth half-cousins one time removed and each share 1.6 per cent of their genes with their common ancestor," David Osborne of The Genealogist was quoted as saying by the daily.
The pair can both be traced to Richard William Penn Curzon-Howe, who was the 1st Earl Howe and Diana's great-great-grandfather.
"His first wife, Lady Harriet, goes into Cressida's line. But when she died, Earl Howe married Anne Gore, and the children they had lead into Harry's line through the Spencers," Osborne said.
Bonas's mother, Lady Mary-Gaye Curzon, was a socialite in the 1960s and granddaughter of Francis Curzon, 5th Earl Howe, a racing driver who won the 1931 Le Mans race.
The family are linked to Britain's wartime leader through Lord Randolph Spencer-Churchill, the father of the future prime minister, who was the brother of Cressida's maternal great-great-grandmother.
