How Queen Elizabeth II and Prince Philip Were Cousins
Queen Elizabeth II and Prince Philip were third cousins, sharing primarily Queen Victoria and King Christian IX as common ancestors. This means each inherited a small fraction of their DNA from the same set of great-great-grandparents, making them distant blood relatives within European royal families. Although they grew up in different national courts—Elizabeth in Britain and Philip in Greece and Denmark—they were linked by the intertwined marriages of Victoria’s children and Christian IX’s children, which shaped modern royal genealogy.
Key Takeaways at a Glance
| Relationship Detail | Verified Detail | Source Type |
|---|---|---|
| Relationship Type | Third cousins | Peerage & genealogy records |
| Most Recent Common Ancestors | Queen Victoria and Prince Albert; King Christian IX and Queen Louise | Published royal biographies |
| Estimated Shared DNA | About 0.78% (on average for third cousins) | Genetic genealogy ranges |
| Marriage Year | 1947 | Court circulars and official records |
| Children | Charles, Anne, Andrew, Edward | Official royal family website |
The Role of Queen Victoria and Christian IX
Queen Victoria and Prince Albert were the primary link for Elizabeth’s British line, while King Christian IX and Queen Louise were the pivotal ancestors for Philip’s Greek and Danish heritage. Victoria’s children married into multiple European houses, spreading her genes widely. Christian IX’s children similarly married across borders, earning him the nickname “the Father-in-law of Europe.” Because both Elizabeth and Philip descend from these two influential couples, their paths converged in the next generation through shared grandchildren who married each other.
Why Third Cousins Still Matter in Royal Genealogy
Third cousins share roughly one great-great-grandparent and typically about 0.78% of their DNA. In royal contexts, these connections were strategically important for consolidating alliances, managing hereditary claims, and preserving particular traits or political influence. For Elizabeth and Philip, the cousin link emphasized continuity within European aristocracy and reflected decades of intertwined dynastic histories. Genealogists use marriage registers, birth records, and probate documents to confirm these lineages with high confidence.
Illustrative Relationship Chain
- Queen Victoria → Princess Alice → Princess Victoria of Hesse → Prince Philip → Philip’s children with Elizabeth.
- King Christian IX → Prince Francis of Teck (via marriage alliances) → connections into British and Greek branches that link back to Elizabeth’s lineage.
Common Misconceptions and Clarifications
Some assume Philip was more closely related to Elizabeth or that they shared a single grandparent, but third cousin relationships involve multiple ancestral pairs and a more diffuse genetic contribution. Others mistakenly believe they were much more closely related due to the prominence of royal intermarriage; in reality, their connection was typical for European aristocracy of the era. Documentation from family archives, biographies, and official genealogies consistently supports the third-cousin classification.
What Their Relationship Meant for the Monarchy
The union of Elizabeth and Philip united several European lines and strengthened postwar diplomatic ties. Their children’s marriages further extended these connections, reinforcing a network of mutual obligations and shared heritage. Understanding that they were third cousins helps contextualize the role of family history in royal legitimacy, public perception, the careful selection of spouses, and the long-term stability of constitutional monarchies.
Frequently Asked Questions
- Were Queen Elizabeth and Prince Philip related before they married? Yes, they were third cousins, meaning they shared great-great-grandparents on multiple sides.
- What is the DNA shared between third cousins? On average, third cousins share about 0.78% of their DNA, though actual percentages can vary.
- Which ancestors connected them most directly? Queen Victoria and Prince Albert on Elizabeth’s side; King Christian IX and Queen Louise on Philip’s side.
- Did their relationship affect royal policy or marriages? Their union reinforced existing alliances and set a precedent for future intra-European royal marriages.
- How is this relationship confirmed? Through peerage records, genealogical research, and, in some cases, genetic genealogy that aligns with documented lineages.
Summary of Core Facts
Queen Elizabeth II and Prince Philip were third cousins, largely due to the marriages of Queen Victoria’s and Christian IX’s children. They shared a small but measurable amount of DNA and a set of distant ancestors. Their wedding in 1947 united two of Europe’s most interconnected royal families. These verified genealogical details explain how their family trees converged and why their relationship remains a frequent topic in studies of royal kinship and dynastic strategy.