September 16, 1997: Apple Computer Inc names co-founder Steve Jobs interim CEO

September 17, 1859: Joshua Abraham Norton, English-born resident of San Francisco, proclaims himself his Imperial Majesty Emperor Norton I, Emperor of the United States of America

September 18, 1502: Christopher Columbus lands at Costa Rica on his 4th & last voyage

September 19, 1940: Witold Pilecki is voluntarily captured and sent to Auschwitz in order to smuggle out information and start a resistance

September 20, 450: Roman General Flavius Aetius defeats Attila the Hun at The Battle of the Catalaunian Plains (Chalons-sur-Marne), halting Hun invasion of Roman Gaul.

September 21, 1776: Nathan Hale, a USA patriot rebel who spied on the British was arrested and executed at the age of 21. He is famous for his reported last words before his execution "I only regret that I have but one life to give for my country."Hale is the state hero of the US state of Connecticut.

September 22, 1499: Switzerland becomes an independent state.

September 23, 1932: Abdulaziz ibn Saud merges the Kingdom of Nejd and Hejaz into the Kingdom of Saudi Arabia

September 24, 1952: American fast food restaurant chain "KFC" [Kentucky Fried Chicken] opens its first franchise in Salt Lake City, Utah

September 25, 1066: Battle of Stamford Bridge; English army under King Harold Godwinson defeat invading Norwegians led by King Harald Hardrada and Harold's brother Tostig, who were both killed.

September 26, 1938:  Adolf Hitler issues ultimatum to Czech government, demanding Sudenten Land

September 27, 1905: The physics journal Annalen der Physik publishes Albert Einstein's paper "Does the Inertia of a Body Depend Upon Its Energy Content?", introducing the equation E=mc².

September 28, 48 BC: Pompey the Great is assassinated on orders of King Ptolemy of Egypt after landing in Egypt.

September 29, 480 BC: Battle of Salamis: The Greek fleet under Themistocles defeats the Persian fleet under Xerxes I

September 30, 1791: Mozart's opera "Magic Flute" premieres in Vienna.