A man who has been claiming to be Charles and Camilla's biological son has penned an open letter to the King and Queen, urging them to finally "come clean."
Simon Dorante-Day has been extremely vocal over the past few years about his involvement with the royals, claiming to be the biological child of King Charles and Queen Camilla - much to the surprise of millions of royal fans.
The 57-year-old was originally born in Portsmouth in 1966 and was later adopted by Karen and David Day before the family moved to Queensland, Australia.
Dorante-Day claimed that his grandmother, who used to work for the late Queen Elizabeth II and Prince Philip alongside her own husband, dropped the bombshell revelation on him which has led him to do some research and conclude that he is, in fact, the son of the United Kingdom's new Head of State.
The engineer has previously made allegations that his eye color was changed and shared side-by-side pictures of his own children to highlight their royal resemblance. He also claims to have made several bids to the Royal Family to complete a DNA test.
Now, his latest open letter might be his most daring move against the Royal Family yet.
In the lengthy piece, which was published in its entirety by 7News, he goes into detail about his feelings on the coronation, as well as his alleged "father's" success.
"On this, the eve of your coronation, when all that you have waited for, and all that you’ve fought for has come to fruition, I hope that you are finally satisfied," the letter, which is directly addressed to "Charles and Camilla" begins. "Maybe now that you’ve achieved your goal you can look in the mirror and remember that it cost and is still costing others for you to succeed."
It continues: "Of course, I am disappointed that my issue couldn’t be resolved before you ascended to the throne, but I feel that in the fullness of time this will reflect more poorly on the Monarchy than it ever will on me."
Dorante-Day then goes on to urge the King and Queen to "reflect" and "resolve my issue once and for all."
"I know the truth, I remember what you did, where you interfered in my life for your own agenda, and I will not stop seeking justice," he says.
In a bold statement, he also states: "Now you are King it doesn’t make me any less your son", before adding that Charles III's ascension to the throne only "endangers us more."
"So, now your time has come I hope you are in a better position to stand-up and do the right thing. Not just for me and my family but for all. Maybe now you can both come clean and admit when you first met because the truth is you haven’t before," the 57-year-old adds. "As monarch and head of the church your behaviour is supposed to be exemplary and above the Law. Currently, the deception, lies, and evasion does not testify that you are."
"I hope you enjoy the day which you’ve waited so long for! I hope it was worth all the suffering that it has cost so far," he says before concluding that he and his family will not be watching the coronation.

In a follow-up interview with the outlet, Dorante-Day opened up about the reasons behind his decision to avoid watching the coronation, stating that despite it being a "significant event", he has "better things to do."
"As an English person, like up until I was a teenager, I would have loved this - I would have been into all the pomp and ceremony. But from an Australian perspective, I couldn’t give a toss," he said. "This is just a waste of money. We could be putting this money towards hospitals, houses, you know. All the homeless people in England are still going to be saying this is a waste of money. And I totally agree."
He went on to add that he believes his alleged father's reign will be "very brief."
"I think it’ll be a short and unmemorable reign - they’re the only words I have," he concluded.
Charles III was formally crowned the King of England as well as 14 other Commonwealth realms on May 6. Camilla was crowned his Queen during the same ceremony.