Prince Charles recently wrote a letter to French President Emmanuel Macron following the devastating fires that plagued Notre Dame.

After the letter was made public, royal fans became convinced that it was Meghan Markle who wrote the letter on behalf of the future king. The Sun’s royal correspondent Emily Andrews said that some of the words in the letter featured American spelling instead of British.

For instance, the word agonizing was spelled as such and not as agonising. Realize was also spelled with a “z” instead of an “s.” Western civilization was spelled with a “z” instead of the British way, western civilisation.

However, Prince Charles’ aides clarified that Markle had nothing to do with writing the letter. After all, the heir to the throne used the correct 15th century versions of English where words are spelled with “ize” and not “ise.” A quick search of Prince Charles’ previous letters also revealed that he has been using recognize and realize, not recognise and realise, for years.

David Adger, a professor of linguistics at Queen Mary University of London, confirmed that Prince Charles’ spelling is technically correct, even though he is British and the use of “ize” may be unusual in the United Kingdom even today.

“The ize spelling is a pretty accurate representation of the Ancient Greek suffix,” he said.

Meanwhile, Markle was also rumored to be writing the captions on her and Prince Harry’s official Instagram account. ITV News’ royal editor Chris Ship said that the “Suits” alum could be behind the couple’s Instagram posts because of the way she spelled some of the words.

Royal commentator Victoria Murphy also said that it’s easy to know if Markle is the one writing certain posts because of her use of American terms.

“Really interesting to see the informal and personal tone the #SussexRoyal social posts use, directly addressing the reader,” she wrote.

Royal reporter Emily Nash also noted how Markle used the word diaper instead of nappy in one of her latest posts.