Michael Fagan (born 8 August 1948) is a British man who broke into Buckingham Palace and entered Queen Elizabeth II's bedroom in 1982. The incident was one of the 20th century's worst royal security breaches.

At around 7:00 am on 9 July 1982, Fagan scaled Buckingham Palace's 14-foot-high (4.3 m) perimeter wall – topped with revolving spikes and barbed wire – and climbed up a drainpipe before wandering into the Queen's bedroom at about 7:15 am.

An alarm sensor had detected his movements inside the palace, but police thought the alarm was faulty and silenced it. Fagan wandered the palace corridors for several minutes before reaching the section where the royal apartments were located. In an anteroom Fagan broke a glass ashtray, cutting his hand. He was still carrying a fragment of the glass when he entered the Queen's bedroom.

The Queen woke when he disturbed a curtain, and initial reports said Fagan sat on the edge of her bed. However, in a 2012 interview, he said she left the room immediately to seek security. She had phoned the palace switchboard twice for police, but none had arrived. Fagan then asked for some cigarettes, which were brought by a maid, who had been cleaning a neighbouring room. The duty footman, Paul Whybrew, who had been walking the Queen's dogs, then appeared, followed by two policemen on palace duty who removed Fagan.

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