Marriage between individuals with common ancestry has been a constant throughout history in European monarchies. Endogamous marriages, for reasons of state, were used to seal political alliances or economic strategies that, over time, resulted in descendants with physical and mental defects and even, as in our country with Carlos II, ended a dynasty.
Shortly after the death of Eduardo VII , monarch of the United Kingdom and emperor of India, known as the uncle of Europe because he was related to almost all the European monarchies, the First World War broke out, which we could call the family war of Edward VII .
- Father of George V, King of England.
- Uncle of Wilhelm II, Kaiser of Germany, and Nicholas II, Tsar of Russia.
- Cousin of Constantine I, King of Greece.
- Brother-in-law of Albert I, King of Belgium; Manuel II, King of Portugal and Ferdinand I, King of Bulgaria.
In addition to others, who did not participate in the First World War, such as Alfonso XIII, King of Spain, of whom he was an uncle.