30 May History
- 1416 - Jerome of Prague is burned as a heretic by the Church.
- 1431 - Joan of Arc is burned at the stake by the English.
- 1527 - The University of Marburg is founded in Germany.
- 1539 - Hernando de Soto lands in Florida with 600 soldiers in search of gold.
- 1783 - The first American daily newspaper, The Pennsylvania Evening Post, begins publishing in Philadelphia.
- 1814 - The First Treaty of Paris is declared, returning France to its 1792 borders.
- 1848 - William Young patents the ice cream freezer.
- 1854 - The Kansas-Nebraska Act repeals the Missouri Compromise.
- 1859 - The Piedmontese army crosses the Sesia River and defeats the Austrians at Palestro.
- 1862 - Union General Henry Halleck enters Corinth, Mississippi.
- 1868 - Memorial Day begins when two women place flowers on both Confederate and Union graves.
- 1889 - The brassiere is invented.
- 1912 - U.S. Marines are sent to Nicaragua to protect American interests.
- 1913 - The First Balkan War ends.
- 1921 - The U.S. Navy transfers the Teapot Dome oil reserves to the Department of the Interior.
- 1942 - The Royal Air Force launches the first 1,000 plane raid over Germany.
- 1971 - NASA launches Mariner 9, the first satellite to orbit Mars.
30 May Birthdays
- 1672 - Peter I (the Great) czar of Russia.
- 1867 - Arthur Vining Davis, American industrialist.
- 1903 - Countee Cullen, American poet.
- 1908 - Hannes Alfvén, Swedish, Nobel Prize-winning astrophysicist.
- 1908 - Mel Blanc, American entertainer, vocal artist.
- 1909 - Benny Goodman, musician, big band leader.
- 1916 - Joseph W. Kennedy, scientist, co-discoverer of plutonium.