The public will be invited to swear allegiance to King Charles and his heirs during the Coronation next weekend.
Being the first royal Coronation we've had since 1953, there'll be a lot of new additions to Saturday's (6 May) ceremony, from a female clergy to religious leaders of other faiths taking part.
Among those changes will be an opportunity for members of the public to have an active role in the Coronation by crying out and swearing their allegiance to the new King.
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The section of the Coronation, called 'homage of the people' will replace the traditional 'homage of peers'.
In previous Coronations, the 'homage of peers' would see the new monarch's hereditary peers swear their allegiance.
In an attempt to perhaps modernise the monarchy, this new 'homage of the people' will give those watching from home a part to play in the big day.
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Describing the new addition to the ceremony, a spokesperson for Lambeth Palace, the Archbishop of Canterbury's office, told the BBC: "The homage of the people is particularly exciting because that's brand new.
"That's something that we can share in because of technological advances, so not just the people in the Abbey, but people who are online, on television, who are listening, and who are gathered in parks, at big screens and churches.
"Our hope is at that point, when the Archbishop invites people to join in, that people wherever they are, if they're watching at home on their own, watching the telly, will say it out loud - this sense of a great cry around the nation and around the world of support for the King."
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So, how will it go on the day?
You'll know it's your turn to 'cry out' in allegiance to King Charles - if you plan on taking part - when the order of service reads: "All who so desire, in the Abbey, and elsewhere, say together: I swear that I will pay true allegiance to Your Majesty, and to your heirs and successors according to law. So help me God."
Some majestic fanfare will then play, before the Archbishop of Canterbury proclaims: "God save the King."
That's when the public will be asked to respond: "God save King Charles. Long live King Charles. May the King live forever."
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This new change to the ceremony comes as part of Lambeth Palace's attempt to 'recognise and celebrate tradition' while adding 'new elements that reflect the diversity of our contemporary society.
Another 'modern' addition to the ceremony is the addition of the Irish language to the Coronation.
For the first time in history, traditional languages spoken in the four countries of the UK - Wales, Scotland, England, and Northern Ireland - will be spoken.
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The Coronation service will begin at 11am on Saturday, 6 May in Westminster Abbey and will be available to watch on BBC One, BBC iPlayer, Sky, and ITV.
Topics: King Charles III, Royal Family, News, UK News