Diana's mtDNA ancestor "Eliza" was a native of Mumbai
"Appointed a Woman of the Bedchamber to Queen Elizabeth the Queen Mother in 1956, Ruth functioned in a world where breeding and good behavior were all-important. While she could adopt the latter, there was no way she could invent the former. Her family was neither grand nor impressive. In fact, the only thing that put them beyond the ordinary was the secret they kept hidden. This was that her great-great grandmother Eliza Kewark was a dark-skinned native of Bombay who had lived, without benefit of matrimony, with her great-great-grandfather Theodore Forbes while he worked for the East India Company. Unsavory as the taint of illegitimacy was, even at that distance in time, it was nothing compared with the stigma of what was then known as "colored blood." Had it been generally known that Ruth and her children were part-Indian, they might never have made good marriages. Eliza's true race was therefore expunged from the family tree and she reemerged as an Armenian. This fiction was maintained even when Diana married the Prince of Wales."
http://extras.denverpost.com/books/chap150.htm
