Workers participating in a restoration project at Kensington Palace in London said they uncovered some 109-year-old graffiti.

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Lee Prosser, buildings curator at Historic Royal Palaces, said workers removed a concealed piece of timber from a post supporting the ceiling next to the royal residence's front door and discovered a neatly-written obscenity accompanied by the name "Peter Jackson" and the date "1/2/1902," The Daily Telegraph reported Friday.

"When this was written he must have thought he was perfectly safe, that nobody in the world would ever lay eyes on it again," Prosser said. "Sadly, we don't know very much about Peter Jackson, but evidently he, like many others throughout history, could not resist the temptation to leave his mark on a royal palace."

A spokeswoman said the piece of timber was replaced with a metal support but will be preserved and put on display.