The funeral on Monday of Britain's Queen Elizabeth II will see the biggest gathering of royalty this century - perhaps ever - in London.
Reigning monarchs, crown princes and royals representing tens of millions of people are expected to arrive from the Middle East and Asia, but it is members of European royal houses who had a particularly close relationship with Her Majesty, some as friends and many as relatives.
So who is attending the funeral, and how are they related to Queen Elizabeth II, if at all? Here's our guide:
King Philippe and Queen Mathilde will be representing Belgium at the funeral on Monday.
Following Queen Elizabeth II's death, the household released a message saying: "We will always keep fond memories of this great Lady who, throughout her reign, showed dignity, courage and devotion. Each of our encounters will remain etched in our memories forever."
And how are the two royal families related? King Philippe's ancestor is King Leopold I, the first King of the Belgians, who was also Queen Victoria's uncle. And Queen Victoria was Queen Elizabeth II's great-great-grandmother.
Denmark's Queen Margrethe II will be attending the funeral, just a week after celebrating the 50th anniversary of her own reign, along with her son Crown Prince Frederik.
Queen Margrethe II was a third cousin of Queen Elizabeth II, and the monarchs were descendants of both Queen Victoria and also King Christian X of Norway (he was Magrethe's grandfather, and Elizabeth's two-times great uncle by marriage).
"Your mother was very important to me and my family," Queen Margrethe wrote in a letter to Britain's King Charles III.
"She was a towering figure among European monarchs and a great inspiration to us all."
Following the death of Queen
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