Queen Elizabeth's 90th birthday: Her love story with Prince Philip

Through the great joys and tremendous hardships that have faced the Queen during her 90 years and record-breaking reign, one person has been steadfastly by her side: her husband Prince Philip. Ever supportive of his wife of more than 68 years, a constant companion he affectionately calls "cabbage," the Duke of Edinburgh is the longest-serving king consort in history. Having first met when Elizabeth was just 13, their courtship saw the couple dedicated to writing letters as Philip headed off to war before they were able to wed in a beautiful ceremony at Westminster Abbey on Nov. 20, 1947. Since then, the family has grown to include four children, eight grandchildren and five great-grandchildren. Watch the video below to relive their courtship, wedding day and see the secrets behind their nearly 70 years together.

The Queen and Prince Philip have traveled around the world countless times and engaged passionately in their hobbies - which are different, and Prince Philip says this is one of the secrets to their long marriage. Prince William, on the other hand, credits another factor with keeping his grandparents together: "He makes her laugh." No doubt, the Queen is often smiling in the presence of her love, and the two surely have one of the greatest royal love stories of all time.

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