Queen Elizabeth II and Prince Philip were third cousins who married in 1947, uniting shared European royal bloodlines that trace to Queen Victoria and Christian IX. Both descended from these monarchs through multiple paths, making them related on both paternal and maternal sides while bringing distinct dynastic traditions into the modern House of Windsor.
How Queen Elizabeth and Philip Were Cousins
Queen Elizabeth II and Prince Philip, Duke of Edinburgh, were third cousins, meaning they shared great-great-grandparents. Their relationship connected the British and Greek royal houses, consolidating a network of European dynasties and reinforcing continuity across postwar monarchies. This kinship linked multiple lines to common ancestors such as Queen Victoria and King Christian IX.
Shared Ancestors: Queen Victoria and Christian IX
Both Queen Elizabeth and Prince Philip descended from Queen Victoria and from King Christian IX of Denmark, creating dual family-tree links through multiple children. Victoria’s lineage spread across European thrones through her children and grandchildren, while Christian IX’s offspring occupied key roles in Denmark, Greece, Norway, and the United Kingdom.
- Queen Victoria (1819–1901) provided shared ancestry via her son Prince Arthur, Duke of Connaught, who fathered Princess Alice of Albany.
- King Christian IX (1824–1906) provided shared ancestry through his son Frederick VIII of Denmark, whose daughter Princess Ina became Prince Philip’s mother.
Prince Philip’s Lineage and Greek-Danish Background
Prince Philip was born into the Greek and Danish royal families, both deeply intertwined with European royalty through descent from Christian IX. His father, Prince Andrew of Greece and Denmark, and his mother, Princess Alice of Battenberg, were themselves products of these converging dynastic lines.
Prince Philip’s Key Ancestors
- Father: Prince Andrew of Greece and Denmark, son of George I of Greece and Grand Duchess Olga Constantinovna of Russia.
- Mother: Princess Alice of Battenberg, daughter of Princess Victoria of Hesse and by Rhine, herself a granddaughter of Queen Victoria.
Queen Elizabeth’s Lineage and Direct Descent from Victoria
Queen Elizabeth II descended from Queen Victoria through her father, King George VI, whose own lineage connected directly to Victoria. This placed her within the British royal succession while also tying her to broader European networks through marriage and shared ancestry.
Queen Elizabeth’s Key Ancestors
- Father: King George VI, son of King George V, who was a grandson of Queen Victoria.
- Mother: Queen Elizabeth The Queen Mother, descended from Scottish aristocracy with further links back to continental royalty through alliances.
Consanguinity and Cousin Levels Explained
Third cousins share great-great-grandparents but not necessarily the same set. For royalty, repeated intermarriage within a small pool of families often increased relatedness, turning many pairings into third, second, or even first cousins once removed.
| Relationship Level | Shared Ancestors | Example in Elizabeth–Philip Pair |
|---|---|---|
| First Cousins | Grandparents | Not applicable here; Elizabeth and Philip were not first cousins. |
| Second Cousins | Great-grandparents | Not their primary relationship. |
| Third Cousins | Great-great-grandparents | Elizabeth and Philip shared multiple VC and Christian IX lines at this level. |
| Once Removed | Different generations | Not applicable; they were of the same generation. |
Family Tree Connections in One Overview
| Line | Connection Type | Key Common Ancestors |
|---|---|---|
| British Side (Elizabeth) | Descent from Victoria and other lines | Queen Victoria; Edward VII |
| Greek/Danish Side (Philip) | Descent from Christian IX and Victoria | King Christian IX; Queen Victoria |
| Consolidated Relation | Third cousins | Multiple shared great-great-grandparents |
Marriage and the House of Windsor
The union of Queen Elizabeth and Prince Philip in 1947 combined these family lines within the framework of the House of Windsor. Philip renounced his Greek and Danish titles, adopted a British-style surname, and formally integrated his heritage into the British royal structure.
Key Outcomes of the Marriage
- Created a direct bond between the British monarchy and the former Greek and Danish royal houses.
- Strengthened continuity by linking long-standing European dynastic traditions to postwar British institutions.
- Set a precedent for how consort roles would evolve in modern constitutional monarchies.
Broader Royal Family Implications
Because many European royals intermarried, relationships like third cousins were common among ruling houses. Queen Victoria and Christian IX served as pivotal nodes, meaning numerous monarchs and consorts around the continent were related through multiple channels. This backdrop helps explain why the Elizabeth–Philip connection is both historically typical and symbolically significant.
Their shared lineage illustrates how family trees in constitutional monarchies function as living archives of diplomacy, succession, and national identity, long outlasting the political changes of the 20th century.
Summary
Queen Elizabeth and Prince Philip were third cousins whose 1947 marriage linked British, Greek, and Danish royal traditions through shared descent from Queen Victoria and King Christian IX. Their family connection exemplifies how consanguinity shaped modern European monarchies, reinforcing both continuity and cooperation across borders.
FAQ
Reader questions
Were Queen Elizabeth and Prince Philip related before they married?
Yes, they were third cousins through shared ancestors including Queen Victoria and King Christian IX.
Which royal houses did their marriage connect?
Their marriage united the British House of Windsor with Greek and Danish royal lines descended from Christian IX and Victoria.
Did their cousin relationship affect succession or protocol?
It did not alter succession law, but it reinforced the interconnected nature of European royal families and informed cultural understanding between the UK and Greece/Denmark.
Are Queen Elizabeth and Prince Philip related to other current monarchs?
Yes, many current European royals share similar descent from Victoria and Christian IX, making them distant relatives across multiple branches.
How distant is a third cousin in practical terms?
Third cousins typically share a small percentage of DNA (around 0.78%) and may not know each other personally, but in royal contexts these links were socially and politically significant.