1525 - The Catholic princes of Germany formed the Dessau League to fight against the Reformation.
1553 - Fifteen-year-old Lady Jane Grey was deposed as Queen of England after claiming the crown for nine days. Mary, the daughter of King Henry VIII, was proclaimed Queen.
1799 - The Rosetta Stone, a tablet with hieroglyphic translations into Greek, was found in Egypt.
1870 - France declared war on Prussia.
1942 - German U-boats were withdrawn from positions off the U.S. Atlantic coast due to effective American anti-submarine countermeasures.
1943 - During World War II, more than 150 B-17 and 112 B-24 bombers attacked Rome for the first time.