Otto IV was crowned Emperor of the Holy Roman Empire by Pope Innocent III.
Source
Following the women's march on Versailles, The National Assembly declared martial law in France to prevent future uprisings.
The National Oceanic and Atmospheric Administration's ITOS-B weather satellite launched atop a Delta rocket.
English chemist John Dalton read his first atomic theory paper to the Manchester Literary and Philosophical society.
Native American Kateri Tekakwitha became the first native to become a saint.
The catastrophic Tragedy of Aberfan occurred in South Wales, killing many who were in a local school, mostly children.