Camilla is set to be crowned the Queen Consort at King Charles' coronation, following the death of Her Majesty the Queen.
Earlier this year, ahead of her Platinum Jubilee, the Queen explained it was her 'sincere wish' that Camilla would become Queen Consort once Charles became King.
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“When, in the fullness of time, my son Charles becomes King, I know you will give him and his wife, Camilla, the same support that you have given me; and it is my sincere wish that, when that time comes, Camilla will be known as Queen Consort as she continues her own loyal service,” the Queen wrote at the time.
Queen Consort is the same title that was given to the Queen Mother - the wife of King George VI - before he passed away.
It essentially means the wife of the reigning monarch.
In the case of a female monarch, husbands of reigning queens are known as Princes Consort.
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Camilla's new title was confirmed by the Palace in the announcement of the Queen's death on Thursday evening.
It read: "The Queen died peacefully at Balmoral this afternoon.
"The King and The Queen Consort will remain at Balmoral this evening and will return to London tomorrow."
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King Charles and the Queen Consort arrived back in London on Friday afternoon, touching down at RAF Northolt.
It is thought that they will then travel on to Buckingham Palace, before King Charles meets with Prime Minister Liz Truss and makes his first broadcast to the nation - which will air at 6pm this evening.
While King Charles will be proclaimed as the new monarch at the televised Accession Council on Saturday morning, it could be some months before his coronation takes place.
While Charles immediately became King after the passing of his mother, an Accession Council is usually held at St James’s Palace in London within 24 hours.
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The Queen's coronation, for example, took place 16 months after her accession.
Buckingham Palace has confirmed a period of royal mourning will be observed for seven days after the Queen's funeral, which is expected to take place in the next 10 days.
The Royal Family’s official website states that a period of respect is ‘observed by members of the Royal Family and their Households, together with troops committed to Ceremonial Duties’.
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It continued: "During this period, Members of the Royal Family will continue undertaking engagements appropriate to the circumstances. Mourning bands will be worn where appropriate."