Thomas Gray first publishes Elegy Written in a Country Churchyard, in The Magazine of Magazines. The poem is now more popularly known as "Gray's Elegy". February 18 – As the Governor of French Louisiana, Pierre de Rigaud, the Marquis de Vaudreuil, issues the first police regulations for New Orleans in an attempt to combat crime in that city. March 25 – For the last time, New Year's Day is legally on March 25, in England and Wales and "in all his Majesty's Dominions in Europe, Asia, Africa and America" due to the Calendar (New Style) Act 1750. The months of January 1751, February 1751 and most of March 1751 did not exist in British territories: those months were recorded as the last three of 1750 according to the Old Style dating system; the equivalent months a year later were recorded as the first three of 1752 under the New Style system. March 31 – Frederick, Prince of Wales, heir-apparent to the British throne, dies of a pulmonary embolism at the age of 44 after a game of cricket. His 12-year-old son, Prince George, becomes the heir-apparent and will later become King George III. Frederick's widow Augusta of Saxe-Gotha becomes Dowager Princess of Wales. April–June April 5 – Sweden's King Frederick I dies at the age of 74 (March 25 on the Julian calendar, which remains in effect in Sweden and Finland until 1753), after a reign of 31 years, bringing an end to the rule of Sweden by the House of Hesse because he has no legitimate heirs. Prince Adolf Frederick of the House of Holstein-Gottorp, who had been elected as the crown prince in 1743, becomes the new King. April 19 – the Qianlong Emperor of China visits the southern capital of Nanjing for the first time, bringing with him 3,000 staff and 6,690 horses and stays for four days April 20 – A month after the death of his father, 12-year old Prince George William Frederick is formally invested as the new Prince of Wales Nine years later, Prince George becomes King George III upon the death of his grandfather, King George II. April 29 – The sport of cricket is first played in the American colonies, as a team of New Yorkers plays against a team of Englishmen and defeats them, 167 to 80, in a match in Greenwich Village May 11 – The Pennsylvania Hospital, first