Question: What Prince Regent likely stayed in Carlton House in 1811?
Related documents: [0]  [DOC] George IV (George Augustus Frederick; 12 August 1762 – 26 June 1830) was King of the United Kingdom of Great Britain and Ireland and of Hanover following the death of his father, George III, on 29 January 1820, until his own death ten years later. From 1811 until his accession, he served as Prince Regent during his father's final mental illness. [END] 
[1]  [DOC] Carlton House was a mansion in London, best known as the town residence of the Prince Regent for several decades from 1783. It faced the south side of Pall Mall, and its gardens abutted St. James's Park in the St James's district of London. The location of the house, now replaced by Carlton House Terrace, was a main reason for the creation of John Nash's ceremonial route from St James's to Regent's Park via Regent Street, Portland Place and Park Square: Lower Regent Street and Waterloo Place were originally laid out to form the approach to its front entrance ("illustration, right"). [END] 
Answer: 
George IV
George IV