Prince William arrived alone at the Duke of Westminster's wedding as Prince Harry and Meghan Markle stayed away from the high-profile event.
The Duke of Westminster is marrying Olivia Henson at Chester Cathedral today.
The Prince of Wales has a close friendship with the duke and is an usher at the wedding.
However, King Charles, Queen Camilla and Princess Catherine will not join William at the wedding in Chester.
Prince William arrived alone at the Duke of Westminster's wedding as Prince Harry and Meghan Markle stayed away from the high-profile event.
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Prince Harry and Meghan Markle were invited but it was agreed the Sussexes would not attend the event to avoid an awkward reunion with the Prince of Wales.
William is not on speaking terms with the Duke and Duchess of Sussex as their royal feud continues.
Prince Harry did not visit his brother during either of his two trips to the UK this year.
The Duke of Westminster is also the godfather to Harry and Meghan's son Prince Archie.
Prince William is attending the event and will take up the role of usher.
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Hugh Grosvenor, the 7th Duke of Westminster, is the fourteenth richest person in Britain, according to the Sunday Times Rich List.
The duke, 33, is also the wealthiest individual in the UK under the age of 40.
Hugh Grosvenor and Olivia Henson released a statement today ahead of their wedding.
A spokesperson for the couple said: "This is an incredibly special day for the Duke and Miss Henson and they are very much looking forward to the service.
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The duke, 33, is the wealthiest individual in the UK under the age of 40.
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"It means a lot to them to marry in Chester Cathedral, especially given the Grosvenor family’s long and close personal connection to both the Cathedral and the city of Chester.
"The couple have also been moved by the messages of support they have received from around the region and are hugely grateful that people want to share in their happiness."
The spokesperson added: "The Duke and Miss Henson have taken a great deal of care in planning the wedding, putting their own personal stamp on all the arrangements and have made a conscious effort to involve local and regional suppliers in several aspects of the day."