On September 3
36 BC In the Battle of Naulochus, Marcus Vipsanius Agrippa, admiral of Octavian, defeated Sextus Pompeius, son of Pompey, which ended Pompeian resistance to the Second Triumvirate.
590 Consecration of Pope Gregory I (Gregory the Great).
1189 Richard I of England (the Lionhearted) was crowned King at Westminster.
1346 Edward III of England began the siege of Calais, along the coast of France.
1650 Third English Civil War: in the Battle of Dunbar, English Parliamentarian forces lead by Oliver Cromwell defeated an army loyal to King Charles II of England and lead by David Leslie, Lord Newark.
1651 Third English Civil War: Battle of Worcester – Charles II of England was defeated in the last main battle of the war.