The Cádiz Memorial, also known as the "Prince Regent's Bomb", is an early 19th-century French mortar mounted on a brass monster, located in Horse Guards Parade in Westminster, London. It was first "exposed to public view" on 12 August 1816 and has been classified as a Grade II listed building since 1 December 1987. The monument was a feature of many satirical verses and cartoons in the early 19th century, mainly because the word "bomb" – pronounced "bum" – gave it an immediate association with the notoriously profligate Prince Regent's sizeable backside.