Haldimand Castle soon became a building of note. On the 19th January, 1787, the anniversary of the Queen's Birthday--Charlotte of Mecklenburg, consort of George III., the first grand reception was held there. In the following summer, the future monarch of Great Britain, William IV., the sailor prince, aged 22 years, visited his father's loyal Canadian lieges. Prince William Henry had then landed, on 14th August, in the Lower Town from H. M. frigate "Pegasus." Traditions repeat that the young Duke of Clarence enjoyed himself amazingly among the _beau monde_ of Quebec, having eyes for more than the scenic beauties of the "Ancient Capital," not unlike other worthy Princes who came after him. "He took an early opportunity of visiting the Ursulines, and by his polite and affable manner quite won the hearts of those worthy ladies."--(_Histoire des Ursulines_, vol. III, p. 183.) Sorel, in honour of his visit, changed its name into Fort William Henry. Among other festivities at Quebec, Lord Dorchester, Governor-General, the successor to Sir Frederick Haldimand, on the 21st August, 1787, treated H. R. Highness to a grand pyrotechnic display. "Prince William Henry and his company, being seated on an exalted platform, erected by the Overseer of Public Works, James Thompson, over a powder magazine joining the end of the new building (Haldimand Castle), while the fireworks were displayed on an eminence fronting it below the _old_ Citadel."--(_Thompson's Diary._) _THE QUEBEC AGRICULTURAL SOCIETY._ In the stately reception room of the Castle was founded, in 1789, the _Quebec Agricultural Society_. "On the 6th April, the rank and fashion, nobility and clergy of all denominations, as well as commoners, crowded at the _Château St. Louis_, to enter their names as subscribers to the Quebec Agricultural Society, warmly patronized by his Excellency Lord Dorchester, Hon. Hugh Finlay, Deputy Postmaster-General, was chosen Secretary. The _Quebec Gazette_ of the 23rd April, 1789, will supply the names, the list is suggestive on more points than one.