A man has admitted to being in possession of a knife and cocaine while trespassing at Buckingham Palace after scaling the fence to the Royal Mews.
Cameron Kalani, 44, had a kitchen knife and cocaine in his bag when he was apprehended in the early hours of May 10.
He appeared at Westminster Magistrates' Court to plead guilty to trespassing on a protected site, possession of a bladed article and possession of a wrap of cocaine.
Prosecutor Alexander Alawode said: "At 4.30am the defendant was seen by a fire marshal near Buckingham Palace Road said to be attempting to climb over the fence and trespass into the grounds.
"He is seen to climb over the fence into the Royal Mews, then back over into Buckingham Palace Road.
"Concerned by the breach of security, palace guards detained him outside the fence a short while later.
"The defendant was described as confused, not knowing where he was or what was happening."
The Royal Mews is part of the Buckingham Palace estate, and houses the royal family's horses.
The court heard Kalani, of Haywards Heath, West Sussex, suffers from schizoaffective disorder and may have been in the midst of an episode at the time and could also have been under the influence of substances.
Natasha Lake, defending, said: "Essentially, Mr Kalani didn't know nor suspect that the site in question was Buckingham Palace."
Deputy Chief Magistrate Tan Ikram adjourned sentencing to December 16 for reports to be prepared.
A Buckingham Palace spokeswoman declined to comment.
Earlier this year, a knifeman managed to enter Buckingham Palace by simply walking through a gate as a vehicle was going in.
Chorrie Thompson, 46, admitted gaining entry to the rear of the royal residence armed with a Stanley knife at around 11.25am on April 15.
Prosecutor Mike Mullin said Thompson made his way to the Lodge area to the right of the large gate before he was confronted by security staff and asked to leave.
"He says he wants to use the toilet and when he was refused permission he becomes aggressive and throws some documents he has onto the floor," Mr Mullin said.
"He was only in there for 10 to 15 seconds before he leaves."
