The coronation invitation has been printed on recycled card and elaborately decorated with foliage in a design by heraldic artist and manuscript illuminator Andrew Jamieson, a Brother of the Art Workers’ Guild which the King is an Honorary Member.
The wording reads: “The Coronation of Their Majesties King Charles III & Queen Camilla – By Command of the King the Earl Marshall is directed to invite…to be present at the Abbey Church of Westminster on 6th day of May 2023.”
At its centre is the motif of the Green Man, an ancient figure from British folklore, symbolic of spring and rebirth, to celebrate the new reign.
In a nod to the King's passion for the natural world, a British wildflower meadow bordering the invitation features lily of the valley, cornflowers, wild strawberries, dog roses, bluebells, and a sprig of rosemary for remembrance, together with wildlife including a bee, a butterfly, a ladybird, a wren and a robin. Flowers appear in groupings of three, signifying The King becoming the third monarch of his name.
And appearing amongst the flowers are three animals, taken from the King and Queen's coats of arms: a lion, a bear and a unicorn.
"Well, I think if you talked to my daughter, she'd say they were real," he laughed, before adding "Obviously, it's a trade secret so I can't possibly comment."
And Charlotte isn't shy about her love for unicorns either.
During her family's visit to the King Power Royal Charity Polo Day in 2019, the Princess was spotted holding a glittery unicorn purse, and then just a few months later on her very first day of primary school, a sparkly pink unicorn keychain could be seen on her backpack.
LISTEN: Why Charles is being strict with the coronation guest list