Victoria's grandfather George III (1760-1820), popularly known as "Farmer George" due to his agrarian interests and modest lifestyle, was the first of the Hanoverians to gain a certain popularity amongst the citizenry during the 60 years of his reign, who viewed him as the morally strict patriarch of a large family. The monarch's unthreatening appearance and reduced abundance of power helped to prevent the spark of revolution from springing over from France to a Great Britain prospering on the awakening of industrialisation. The joint victory of the British and Prussians over Napoleon at Waterloo in 1815 provided for decades the military guarantee of Great Britain's role as the leading export nation. However, the 25-year period prior to Victoria's accession to the throne did not stand under a lucky star. The upright, modest "Farmer George" spent the last decade of his life at Windsor Castle in a state of mental derangement. Even more disastrous for the prestige of the monarchy was the complete failure of his principles of upbringing.