• It's been 20 years since Princess Margaret died
  • Queen Elizabeth let her sister's ex see her tomb
  • Roddy Llewellyn and Margaret had an affair

The 20th anniversary of Princess Margaret's death passed this week on Feb. 9. The royal's ashes rest in a tomb inside Windsor Castle, and Queen Elizabeth reportedly permitted a rare visitor there this week.

Roddy Llewellyn visited Princess Margaret on her death anniversary

According to the Daily Mail, Princess Margaret's ex Roddy Llewellyn was "granted special permission" to pay his respects at the King George VI Memorial Chapel on Feb. 9.

Princess Margaret's ashes are interred in the chapel within Windsor Castle. Llewellyn, now 74, would have visited Windsor, where the Queen lives, on Wednesday this week.

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Roddy Llewellyn visited Princess Margaret's ashes on her death anniversary.

Margaret and Roddy are said to have had an eight-year love affair while the royal was still married to Antony Armstrong-Jones.

Princess Margaret was 17 years older than Llewellyn, and the affair eventually leaked out in the tabloids in the mid-1970s.

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Nevertheless, almost 50 years later, Queen Elizabeth appears to have signed off on Llewellyn's visit.

Princess Margaret, the Queen's only sibling, died after a stroke on Feb. 9, 2002.