Editing George III (section)

===Final years===
[[File:George III by Henry Meyer.jpg|thumb|right|Engraving by [[Henry Hoppner Meyer|Henry Meyer]], 1817, depicting an elderly George|alt=Monochrome profile of elderly George with a long white beard]]
In late 1810, at the height of his popularity,<ref>Brooke, p. 381; Carretta, p. 340.</ref> King George, already virtually blind with [[cataract]]s and in pain from [[rheumatism]], suffered a relapse into his mental disorder and became dangerously ill. In his view, the malady had been triggered by stress over the death of his youngest and favourite daughter, [[Princess Amelia of the United Kingdom|Princess Amelia]].<ref>Hibbert, p. 396.</ref> The princess's nurse reported that "the scenes of distress and crying every day{{nbsp}}... were melancholy beyond description."<ref>Hibbert, p. 394.</ref> George accepted the need for the [[Regency Act 1811]],<ref>Brooke, p. 383; Hibbert, pp. 397–398.</ref> and the Prince of Wales (later [[George IV]]) acted as regent for the remainder of the King's life. Despite signs of a recovery in May 1811, by the end of the year, George III had become permanently insane, and lived in seclusion at Windsor Castle until his death.<ref>Fraser, p. 285; Hibbert, pp. 399–402.</ref>

Prime Minister Spencer Perceval was [[Assassination of Spencer Perceval|assassinated in 1812]] and was replaced by [[Lord Liverpool]]. Liverpool oversaw British victory in the Napoleonic Wars. The subsequent [[Congress of Vienna]] led to significant territorial gains for Hanover, which was elevated from an [[Electorate of Hanover|electorate]] to a [[Kingdom of Hanover|kingdom]]. Meanwhile, George's health deteriorated. He developed [[dementia]], and became completely blind and increasingly deaf. He was incapable of knowing or understanding that he was declared King of Hanover in 1814, or that his wife died in 1818.<ref>Ayling, pp. 453–455; Brooke, pp. 384–385; Hibbert, p. 405.</ref> At Christmas 1819, he spoke nonsense for 58 hours, and for the last few weeks of his life was unable to walk.<ref>Hibbert, p. 408.</ref>

He died of [[pneumonia]] at [[Windsor Castle]] at 8:38&nbsp;pm on 29 January 1820, six days after the death of his fourth son [[Prince Edward, Duke of Kent and Strathearn]].<ref name="Black, p. 410">Black, p. 410.</ref> His favourite son, [[Prince Frederick, Duke of York and Albany]], was with him.<ref>Letter from Duke of York to George IV, quoted in Brooke, p. 386.</ref> George III [[lay in state]] for two days, and his funeral and interment took place on 16 February in [[St George's Chapel, Windsor Castle]].<ref name="Black, p. 410" /><ref>{{cite web |title=Royal Burials in the Chapel since 1805 |url=https://www.stgeorges-windsor.org/about-st-georges/royal-connection/royal-burials/royal-burials-chapel-since-1805/ |access-date=7 November 2017 |website=St George's Chapel, Windsor Castle |publisher=Dean and Canons of Windsor}}</ref><ref>Brooke, p. 387.</ref>