But why is Prince Philip not king?
So while Diana became Princess of Wales when she married Prince Charles, Philip did not become British royalty through his marriage to Elizabeth.
Similarly, Prince Albert was never a king through his marriage to Queen Victoria. Philip was born Prince Philip of Greece and Denmark.
WHAT WAS PRINCE PHILIP LIKE AS A YOUNG MAN?
Prince Philip has announced that he will retire from public duties this year
The Queen and Prince Philip will celebrate their 70th wedding anniversary this year
Philip renounced his titles ahead of his marriage to the then-Princess Elizabeth, and adopted the surname Mountbatten.
The day before the wedding in 1947, he was created His Royal Highness The Duke Of Edinburgh by King George VI.
In 1957, the Queen created her husband a Prince of the United Kingdom, restoring his royal status.