As Prince Harry and Meghan Markle tied the knot last month, a man appearing to be a British expert on the Royal Family gave interviews to international broadcasters.
But according to US media reports, he is in fact an American from upstate New York.
Thomas J Mace-Archer-Mills Esq, the chairman of the British Monarchist Society and Foundation (BMSF), featured in the royal wedding coverage for several overseas outlets who interviewed him in the belief they were speaking to an authentic Englishman.
However, according to the Wall Street Journal, he is 38-year-old Thomas "Tommy" Muscatello - an Italian-American, who grew up in New York.
Speaking to a Norwegian broadcaster, he reportedly warned the former Suits actress that the marriage should be about "keeping integrity, keeping formality and making sure that the traditions and heritage that we have as British people remain at the forefront".
In another interview he gave to a US outlet, he reportedly told the bride-to-be not to upstage members of the Royal Family "especially when you're coming in the way you are".
Videos posted to the BMSF YouTube page document his many media appearances and his work at various monarchist conferences.
In one video filmed in St James' Park, near Buckingham Palace, he jokingly talked to a Shaun the Sheep statue, which was wearing a crown, and he said: "We have a little fun here in London, monarchy is always so stiff and proper and firm and 'how dare you make fun and have a laugh'.
"But the Royal Family and the Queen herself, they have a wicked sense of humour and so should we."
Mace-Archer-Mills told the Wall Street Journal he identified more as being British than American and that he had been obsessed with the UK as a child. However, he declined to talk about his nationality.
He said he had adopted a British accent and started ending conversations by saying "God save the Queen" - despite living in Bolton Landing, New York.
The royal enthusiast said he adopted his surname by putting together "names of friends and distant relations". He also told the paper he had an agreement with two unrelated, elderly British people to call them his grandfather and grandmother.
Mace-Archer-Mills, who is editor of Crown & Country Magazine and even launched a royal-themed cryptocurrency, responded to the original article and said the Wall Street Journal "omitted truths".
"The Wall Street Journal breached journalistic trust, omitted truths and mis-sold what the initial interview was for," he said.
"Many of the facts in the article are inaccurate and the Wall Street Journal itself was given many opportunities to ensure that the article was published with the most accurate information available. The WSJ chose not to adhere to the facts or their integrity."