Their Family Relationship at a Glance
Queen Elizabeth II and Prince Philip were third cousins, sharing both Queen Victoria and King Christian IX as shared ancestors. Their most notable family connection stems from Princess Alice of Greece, linking the British and Greek royal houses through descent from Queen Victoria. This evergreen explainer clarifies how two widely known royals were related, why their union was significant, and how their lineage shaped modern European royalty.
Defining Third Cousins and Royal Intermarriage
Third cousins share at least one pair of great-great-grandparents and typically have proportional shared DNA, often ranging in the low percentage. Royal families frequently intermarried to preserve dynastic ties, meaning many European royals were related by blood or marriage. For Queen Elizabeth II and Prince Philip, their relationship as third cousins reflects how interconnected European aristocracy became through generations of arranged unions and strategic marriages.
Shared Ancestry: Queen Victoria and Christian IX
Both Queen Elizabeth II and Prince Philip descended from Queen Victoria, making them distant blood relatives through the British line. They also shared King Christian IX of Denmark as an ancestor, binding the British and Danish royal families across generations. This dual lineage from two influential monarchs created multiple familial connections beyond their most famous link through Princess Alice.
Princess Alice of Greece: The Direct Link
Princess Alice of Greece and Denmark was the mother of Prince Philip and a granddaughter of Queen Victoria. Through her, Prince Philip was directly descended from the British monarch, aligning him closely with Queen Elizabeth II. This connection elevated the significance of their marriage in 1947, merging two prominent royal houses and reinforcing stability within postwar European monarchies.
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Relationship | Third cousins | Royal genealogical records |
| Shared ancestors | Queen Victoria and King Christian IX | Published biographies and official lineage charts |
| Key familial link | Princess Alice of Greece, granddaughter of Queen Victoria and mother of Prince Philip | Royal archives and historical biographies |
| Wedding significance | Marriage united British and Greek royal lines, strengthening postwar diplomatic symbolism | Historical news archives and royal records |
Contextualizing Cousin Marriages in Royal History
Historically, royal families arranged marriages among relatives to consolidate power, maintain wealth, and preserve specific lineage traits. Queen Elizabeth II and Prince Philip’s connection as third cousins was relatively common within 19th- and early 20th-century European royalty. While modern audiences often view such unions as unusual, they were once standard practice among dynasties seeking to secure political alliances and continuity.
Key Notable Details and Historical Moments
Their engagement in 1947 was widely covered, emphasizing romance while downplaying the underlying family ties that linked them through multiple royal branches. The wedding at Westminster Abbey symbolized continuity for a Britain still recovering from World War II, uniting families from Greece, Denmark, and the United Kingdom. As reigning monarch and consort, Queen Elizabeth II provided steady leadership, while Prince Philip supported her throughout a changing global landscape.