October 4 is the 277th day of the year (278th in leap years) in the Gregorian calendar. There are 88 days remaining until the end of the year.
Events:
23 – Rebels capture and sack the Chinese capital Chang'an during a peasant rebellion. They kill and decapitate the emperor, Wang Mang, two days later.
610 – Heraclius arrives by ship from Africa at Constantinople, overthrows Byzantine Emperor Phocas and becomes Emperor.
1227 – Assassination of Caliph al-Adil.
1302 – A peace treaty between the Byzantine Empire and the Republic of Venice ends the Byzantine–Venetian War (1296–1302).
1363 – End of the Battle of Lake Poyang; the Chinese rebel forces of Zhu Yuanzhang defeat that of his rival, Chen Youliang, in one of the largest naval battles in history.
1511 – Formation of the Holy League of Ferdinand II of Aragon, the Papal States and the Republic of Venice against France.
1535 – The first complete English-language Bible (the Coverdale Bible) is printed, with translations by William Tyndale and Myles Coverdale.
1582 – Pope Gregory XIII implements the Gregorian calendar. In Italy, Poland, Portugal, and Spain, October 4 of this year is followed directly by October 15.
1597 – The first Guale uprising begins against the Spanish missions in Georgia.
1636 – The Swedish Army defeats the armies of Saxony and the Holy Roman Empire at the Battle of Wittstock.