What DNA Revealed About Princess Diana’s Maternal Line – WHO WAS SHE?

How DNA Uncovered a Forgotten Ancestor Hidden Within Princess Diana’s Family History

For generations, the Spencer family stood as one of Britain’s most celebrated aristocratic lineages.

Their ancestry had been meticulously documented in genealogical records, reinforcing the widely accepted belief that Princess Diana’s maternal family represented a classic example of old English nobility.

Few historians had reason to question that narrative—until a genetic study conducted in 2013 revealed an unexpected discovery that pointed toward a forgotten chapter of the family’s past.

The breakthrough emerged during a genetic ancestry project involving maternal relatives connected to Diana’s family.

Researchers analyzed mitochondrial DNA, a unique form of genetic material that passes exclusively from mothers to their children while only daughters continue transmitting it to future generations.

Unlike most DNA, mitochondrial DNA changes very little over time, making it one of the most reliable tools for tracing an unbroken maternal lineage across centuries.

The results surprised everyone involved.

Researchers identified a rare mitochondrial haplogroup known as R30b.

According to the source, this genetic marker had been documented almost exclusively among people originating from the Indian subcontinent.

Within the research database available at the time, only a handful of individuals carried the same lineage, with nearly all of them living in India or Nepal.

For a family widely regarded as representing traditional English aristocracy, the finding raised an obvious question.

Where had this South Asian maternal ancestry entered the Spencer family?

The answer led researchers to a woman named Eliza Kewark.

Born around 1790 in the thriving port city of Surat on India’s western coast, Eliza lived during a period when British East India Company merchants frequently established relationships with local communities.

Historical records indicate that she formed a relationship with Scottish merchant Theodore Forbes, who worked for the East India Company after arriving in India in the early nineteenth century.

Together, they had two children, including a daughter named Katherine.

Although official legal documents later described Eliza simply as Forbes’s “housekeeper,” surviving historical evidence suggests their relationship extended far beyond that formal description.

The source explains that Surat was one of the British Empire’s most important commercial centers during this period.

Its population included Indian, Armenian, Persian, Portuguese, Dutch, and numerous other trading communities whose interactions created an unusually cosmopolitan environment.

Relationships between European merchants and local women were relatively common during the earlier years of British commercial expansion.

Over time, however, colonial attitudes changed.

As British rule became increasingly formalized, mixed-heritage relationships often became social and professional liabilities for ambitious colonial officials.

Those shifting attitudes would profoundly shape how Eliza’s story was recorded—and how much of it was quietly omitted from later family histories.

Following Theodore Forbes’s death, official records referred to Katherine as his “reputed natural daughter,” language commonly used during that era to distinguish children born outside formal marriage.

According to family accounts discussed in the source, Katherine was eventually sent to Scotland, where she entered respectable British society and later married into established families.

From that point forward, the family’s documented history increasingly emphasized Eliza’s Armenian background while overlooking the South Asian maternal ancestry revealed generations later through DNA testing.

The mitochondrial lineage, however, remained completely unchanged.

Each daughter unknowingly carried the same genetic marker passed down directly from Eliza Kewark through successive generations.

That uninterrupted maternal line eventually reached Frances Spencer.

On July 1, 1961, Frances gave birth to Diana Frances Spencer, carrying forward the same mitochondrial DNA that had remained biologically intact for approximately seven generations despite centuries of changing family narratives.

According to the source, this discovery illustrates how genetics can preserve historical information long after official records have simplified, altered, or omitted important details.

Researchers strengthened their conclusions by testing multiple maternal descendants independently.

The source explains that two separate relatives sharing the documented maternal lineage produced matching mitochondrial results.

Combined with genealogical records and additional autosomal DNA findings showing small amounts of South Asian ancestry among living descendants, the study assembled several independent lines of evidence supporting the same historical conclusion.

Rather than relying upon a single laboratory result, the research combined genetics with traditional historical documentation.

The discovery also attracted attention because it highlighted broader themes extending beyond one famous family.

According to the source, similar genetic studies have increasingly revealed overlooked South Asian, African, and mixed-heritage ancestors within prominent Western families whose official histories were shaped during the colonial era.

In many cases, social pressures encouraged families to emphasize certain aspects of ancestry while minimizing others considered less acceptable at the time.

Eliza Kewark’s story became particularly well documented because researchers could combine surviving correspondence, estate records, genealogical documentation, and unusually distinctive genetic evidence into one coherent historical narrative.

The biological journey of this particular mitochondrial lineage also has a natural conclusion.

Because mitochondrial DNA passes only through maternal lines, both Prince William and Prince Harry inherited Eliza Kewark’s mitochondrial DNA from Princess Diana.

However, neither can pass that lineage to their own children, who instead inherit mitochondrial DNA exclusively from their mothers.

According to the source, this means the traceable maternal genetic line stretching back to Eliza effectively ends with Diana’s sons.

Ultimately, this remarkable discovery is not simply a story about royal ancestry.

It illustrates how modern science can complement historical research by restoring attention to individuals whose identities became obscured through changing social attitudes and incomplete documentation.

Official records may have reduced Eliza Kewark’s role to a brief legal description, but the genetic evidence preserved another part of her story across more than two centuries.

Rather than rewriting history, the 2013 findings expanded it—revealing a richer and more complex family narrative than generations of official records had ever acknowledged.

In doing so, the study demonstrated that while historical documents can be edited, forgotten, or selectively remembered, biology quietly preserves its own record across the centuries.