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.

[3] 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.

While on the south side the following inscription appears: To commemorate the Raising of the Siege of Cadiz, in consequence of the Glorious Victory obtained by the Duke of Wellington over the French at Salamanca, on the 22d July 1812: This Mortar, cast for the destruction of that Great Port, with Powers surpassing all others, and abandoned by the Besiegers on their Retreat, was presented as a token of respect and gratitude by the Spanish Nation, To his Royal Highness the Prince Regent.

"[6] According to one Royal Engineer who saw the mortar in action, he watched it fire a shot into the middle of the crowded Plaza de San Antonio in the centre of Cádiz "without injuring a single individual".

Lawler wrote of its report, its wind and "width, breadth and monstrous size" and predicted that the Poet Laureate would "sing the charming odour of the thing".

And first approach three 'secret hags,' Then him the R——t [Regent] calls 'Old Bags;' [the Lord Chancellor, John Scott, 1st Earl of Eldon] Methinks I see V———t [Vansittart] come, And humbly kiss the royal Bomb!

While T——y W———y [Tylney Wellesley], (loyal soul) Will take its measure with a Pole; And C———h [Castlereagh] will low beseech To kiss a corner of the breech; And next will come of G——y R—e, [George Rose] And in the touch-hole shove his nose!

[8][10] The poem was accompanied by a cartoon drawn by George Cruikshank, which showed the Prince Regent as the personification of the mortar with a queue of ministers lining up to kiss his backside.