On July 21
356 BC The Temple of Artemis in Ephesus, one of the Seven Wonders of the World, was destroyed by arson.
230 Pope Pontian succeeded Urban I as the eighteenth pope.
285 Diocletian appointed Maximian as Caesar and co-ruler.
365 A tsunami devastated the city of Alexandria, Egypt. The tsunami was caused by an earthquake estimated to be 8.0 on the Richter Scale. 5,000 people perished in Alexandria, and 45,000 more died outside the city.
1403 Battle of Shrewsbury: King Henry IV of England defeated rebels to the north of the county town of Shropshire, England.
1545 The first landing of French troops on the coast of the Isle of Wight during the French invasion of the Isle of Wight.
1588 The Armada - an invasion fleet sent by Philip II of Spain - was sighted off the coast of Cornwall.