Muhammad Ali invited the Mamluk leaders to a celebration at the Cairo Citadel in honor of his son, Tusun Pasha, who was to lead a military expedition into Arabia. The event was held on 1 March 1811. When the Mamluks had gathered at the Citadel and were surrounded and killed by Muhammad Ali's troops.
On 20 March 1811, Marie Louise gave birth to a baby boy, whom Napoleon made heir apparent and bestowed the title of King of Rome. His son never actually ruled the empire, but given his brief titular rule and cousin Louis-Napoléon's subsequent naming himself Napoléon III, historians often refer to him as Napoleon II.
William Du Bois claimed Elizabeth Freeman as his relative; he wrote that she had married his great-grandfather Jack Burghardt. But Freeman was 20 years older than Burghardt, and no record of such a marriage has been found. It may have been Freeman's daughter, Betsy Humphrey, who married Burghardt after her first husband, Jonah Humphrey, left the area "around 1811", and after Burghardt's first wife died (c. 1810). If so, Freeman would have been William Du Bois's step-great-great-grandmother. Anecdotal evidence supports Humphrey's marrying Burghardt; a close relationship of some form is likely.
State banquets also take place in the Ballroom; these formal dinners are held on the first evening of a state visit by a foreign head of state. On these occasions, for up to 170 guests in formal "white tie and decorations", including tiaras, the dining table is laid with the Grand Service, a collection of silver-gilt plate made in 1811 for the Prince of Wales, later George IV. The largest and most formal reception at Buckingham Palace takes place every November when the Queen entertains members of the diplomatic corps. On this grand occasion, all the state rooms are in use, as the royal family proceed through them, beginning at the great north doors of the Picture Gallery. As Nash had envisaged, all the large, double-mirrored doors stand open, reflecting the numerous crystal chandeliers and sconces, creating a deliberate optical illusion of space and light.
In 1811, the fundamentalist Wahhabis of Arabia, led by the al-Saud family, revolted against the Ottomans. Unable to defeat the Wahhabi rebels, the Sublime Porte had Muhammad Ali Pasha of Kavala, the vali (governor) of the Eyalet of Egypt, tasked with retaking Arabia, which ended with the destruction of the Emirate of Diriyah in 1818. The suzerainty of Serbia as a hereditary monarchy under its own dynasty was acknowledged de jure in 1830.
From October 1811 to January 1812, Fulton, along with Livingston and Nicholas Roosevelt (1767–1854), worked together on a joint project to build a new steamboat, New Orleans, sturdy enough to take down the Ohio and Mississippi rivers to New Orleans, Louisiana. It traveled from industrial Pittsburgh, Pennsylvania, where it was built, with stops at Wheeling, Virginia; Cincinnati, Ohio; past the "Falls of the Ohio" at Louisville, Kentucky; to near Cairo, Illinois, and the confluence with the Mississippi River; and down past Memphis, Tennessee, and Natchez, Mississippi, to New Orleans some 90 miles (140 km) by river from the Gulf of Mexico coast. This was less than a decade after the United States had acquired the Louisiana Territory from France. These rivers were not well settled, mapped, or protected. By achieving this first breakthrough voyage and also proving the ability of the steamboat to travel upstream against powerful river currents, Fulton changed the entire trade and transportation outlook for the American heartland.