Dennis Hennessy from Wembley admitted to trespassing and causing criminal damage and was jailed.
The man who scaled a wall at Buckingham Palace is a convicted murderer, a court has been told.
Dennis Hennessy, of Barnhill Road, Wembley was caught in the grounds of the palace on May 18 after tripping off an alarm.
He had cut his right hand as he climbed over the top of the wall, which is between 8ft to 10ft high, and set the alarm off.
The Queen was in Buckingham Palace when Dennis Hennessy scaled a wall
He then walked around the gardens for around 10 minutes towards the Palace, where the Queen was in residence with the Duke of Edinburgh and the Duke of York, before being arrested by armed police.
‘Is Ma’am in?’
The 41-year-old later told police he was “admiring” the Royal gardens and asked police when he was arrested : “Is Ma’am in?” He had been in the grounds for seven minutes.
Hennessey pleaded guilty at Westminster Magistrates’ Court to one count of trespass on a protected site and one count of criminal damage. He was later jailed for four months.
New Fathers 4 Justice later told getwestlondon that security at Buckingham Palace “is dreadful”.
A member said while holding reconnaissance of the palace they “were able to get out take several photographs and were even able to use a tape measure to size up a banner without being challenged”.