Deaths on April 21

Johann Friedrich Pfaff

Died on April 21, 1825

Johann Friedrich Pfaff, German mathematician and academic (b. 1765)

Johann Friedrich Pfaff (sometimes spelled Friederich; 22 December 1765 – 21 April 1825) was a German mathematician. He was described as one of Germany's most eminent mathematicians during the 19th century. He was a precursor of the German school of mathematical thinking, which under Carl Friedrich Gauss and his followers largely determined the lines on which mathematics developed during the 19th century.

References

Johann Friedrich Pfaff

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Events on 1825

27 Jan

Indian Territory
The U.S. Congress approves Indian Territory (in what is present-day Oklahoma), clearing the way for forced relocation of the Eastern Indians on the "Trail of Tears".
9 Feb

United States presidential election, 1824
After no candidate receives a majority of electoral votes in the US presidential election of 1824, the United States House of Representatives elects John Quincy Adams as President of the United States.
2 Mar

Capture of the El Mosquito
Roberto Cofresí, one of the last successful Caribbean pirates, is defeated in combat and captured by authorities.
4 Jun

Visit of the Marquis de Lafayette to the United States
General Lafayette, a French officer in the American Revolutionary War, speaks at what would become Lafayette Square, Buffalo, during his visit to the United States.
22 Jun

Seigneurial system of New France
The British Parliament abolishes feudalism and the seigneurial system in British North America.

Deaths on April 21

Johann Friedrich Pfaff

Died on April 21, 1825

References

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Events on 1825

Indian Territory

United States presidential election, 1824

Capture of the El Mosquito

Visit of the Marquis de Lafayette to the United States

Seigneurial system of New France