Events January–March January 1 Battle of Koregaon: Troops of the British East India Company score a decisive victory over the Maratha Empire. Mary Shelley's Frankenstein is published anonymously in London. January 2 – The British Institution of Civil Engineers is founded. January 3 (21:52 UTC) – Venus occults Jupiter. It is the last occultation of one planet by another before November 22, 2065. January 6 – The Treaty of Mandeswar brings an end to the Third Anglo-Maratha War, ending the dominance of Marathas, and enhancing the power of the British East India Company, which controls territory occupied by 180 million Indians. January 11 – Percy Bysshe Shelley's Ozymandias is published pseudonymously in London. January 12 – The Dandy horse (Laufmaschine bicycle) is invented by Karl Drais in Mannheim. February 3 – Jeremiah Chubb is granted a British patent for the Chubb detector lock. February 5 – Upon his death, King Charles XIII of Sweden (Charles II of Norway) is succeeded on both thrones by his adoptive son Charles XIV/III John, starting the Royal House of Bernadotte. February 11 – Marie André Cantillon attempts to assassinate the Duke of Wellington in Paris. February 12 – Chilean Declaration of Independence from Spain is proclaimed in Chile. March 15 – First Seminole War: General Andrew Jackson and his American army invade Florida. March 22 – Easter Sunday in Western Christianity falls on its earliest possible date. In Western Christianity, it will not occur on this date again until 2285. April–June April 1 – First Seminole War – Battle of Miccosukee, Florida: General Andrew Jackson defeats chief Kinhagee. April 4 – The United States Congress adopts the flag of the United States as having thirteen red and white stripes, and one star for each state (twenty), with additional stars to be added whenever a new state is added to the Union. April 5 – Chilean War of Independence – Battle of Maipú: Patriot rebels, led by José de San Martín, decisively defeat the Spanish Royalists. April 7 – Brooks Brothers, the oldest men's clothier in the United States, opens its first store on the northeast corner of Catherine and Cherry Streets in New York City, where the later South Street Seaport stands. April 14–August 9 – The United States Survey of the Coast operations is suspended. April 18 – John Ross sets sail on his ship, the Isabella, in search of the Northwest Passage.