On This Day: June 20th

The U.S. Congress adopts the Great Seal of the United States.

A British garrison is imprisoned in the Black Hole of Calcutta.

Monmouth Rebellion: James Scott, 1st Duke of Monmouth declares himself King of England at Bridgwater.

Tarhoncu Ahmed Pasha is appointed Grand Vizier of the Ottoman Empire.

The Sack of Baltimore: The Irish village of Baltimore is attacked by Barbary slave traders.

The Battle of Höchst takes place during the Thirty Years' War.

The Treaty of Anagni, an attempt mediated by the papacy to end the War of the Sicilian Vespers, is signed by the crown of Aragon, the kingdom of France and kingdom of Naples.

Michael I Komnenos Doukas, the first ruler of the despotate of Epirus, signs a treaty with the Republic of Venice and becomes their vassal.

First Battle of Uji, starting the Genpei War in Japan.

Battle of Chalons: Flavius Aetius battles Attila the Hun. After the battle, which was inconclusive, Attila retreats, causing the Romans to interpret it as a victory.