1. 252 - Sun Quan, the founding emperor of the Wu state in the Three Kingdoms period, passed away.

2. 613 - Emperor Yang of the Sui Dynasty led a personal expedition against Goguryeo. After failing to capture Liaodong in 20 days with heavy casualties, Yang Xuangan, who was in charge of grain and grass in Jiyang, rebelled. So, Emperor Yang secretly returned to suppress the rebellion.

3. 878 - Syracuse was captured by the Muslim sultan of Sicily.

4. 879 - Pope John VIII blessed Duke Branimir and the Croatian people, which was regarded as the international recognition of the Croatian state.

5. 996 - Pope Gregory V crowned his cousin Otto III as the Holy Roman Emperor in St. Peter's Basilica in Rome.

6. 1040 - King Henry III granted the Groninger currency to Utrecht.

7. 1066 - Su Xun, the father of Su Shi, passed away.

8. 1086 - Wang Anshi, a famous statesman, litterateur, and thinker in the Northern Song Dynasty, passed away.

9. 1107 - Zhao Gou, the founding emperor of the Southern Song Dynasty, was born.

10. 1216 - French Crown Prince Louis entered England, invited by the barons at war with King John. He landed on the Isle of Thanet in England with little casualties and was recognized as the King of England by King Alexander II of Scotland but not crowned.

11. 1260 - Hao Jing, an envoy of Kublai Khan, was imprisoned by Jia Sidao, the high chancellor of the Song Dynasty, at the court of Emperor Lizong while attempting to negotiate with the Song Dynasty.

12. 1281 - Kublai Khan's second invasion of Japan began with an attack on Tsushima Island but met fierce resistance, and his troops were forced to withdraw.

13. 1358 - The "Jacquerie" peasant uprising broke out in France.

14. 1382 - An earthquake centered on the Dover Strait with an estimated magnitude of 6.0 caused widespread damage, including to Canterbury Cathedral.

15. 1420 - The Treaty of Troyes was signed. Henry V of England and his heirs would inherit the throne of France upon the death of King Charles VI of France.

16. 1471 - King Edward IV entered London. King Henry VI of England passed away.

17. 1499 - Francisco de Bobadilla was appointed governor of the Indies, succeeding Christopher Columbus.

18. 1502 - Portuguese explorer João da Nova discovered the uninhabited Saint Helena Island in the South Atlantic Ocean.

19. 1542 - Spanish explorer Hernando de Soto died while searching for gold along the Mississippi River.

20. 1575 - The Battle of Lepanto broke out. The Ottoman Empire Navy fought a fierce battle with the combined fleet of Spain, Venice, and other countries in the waters near Lepanto, Greece.

21. 1602 - Martha's Vineyard was first sighted by Captain Bartholomew Gosnold.

22. 1639 - Italian philosopher Campanella passed away. His masterpiece The City of the Sun had an important influence on the development of utopian socialist thought.

23. 1674 - General John Sobieski was chosen as the King of Poland.

24. 1683 - The West Indian Company sold one - third of Suriname.

25. 1725 - The Order of St. Alexander Nevsky was instituted in Russia by Empress Catherine I.

26. 1755 - Hanlin scholar Hu Zhongzao was beheaded for the "treasonous and satirical" remarks in his Poetry Collection of Jianmo Sheng, a typical case of the literary inquisition in the Qing Dynasty.

27. 1758 - Mary Campbell was abducted from her home in Pennsylvania by the Lenape during the French and Indian War.

28. 1786 - Swedish chemist Carl Wilhelm Scheele passed away. Scheele made many important discoveries in the field of chemistry, such as the discovery of oxygen and chlorine.

29. 1792 - Mount Unzen on Japan's Shimabara Peninsula erupted, creating a tsunami that killed about 15,000 people, the deadliest volcanic eruption in Japan.

30. 1793 - The Curacao Island Council forbade criticism of the House of Orange.

31. 1799 - Napoleon and his forces abandoned their siege of Acre after two months, a turning point in the French invasion of Egypt and Syria.

32. 1809 - The Battle of Aspern - Essling: Austrian Archduke Charles defeated Napoleon and his army, Napoleon's first defeat in 10 years.

33. 1832 - The first US Democratic National Convention was held in Baltimore.

34. 1840 - Captain William Hobson proclaimed British sovereignty over New Zealand.

35. 1860 - Dutch pathologist and inventor of the electrocardiogram, Willem Einthoven, was born.

36. 1871 - The "Bloody Week in May" in Paris, France, began. Paris Commune soldiers fought a fierce battle with the Versailles army. Eventually, the Paris Commune failed, but it was a great attempt by the proletariat to establish a regime.

37. 1873 - The people of Ruichang, Jiangxi, demolished the American church, reflecting the resistance of the Chinese people to the aggressive acts of foreign churches at that time.

38. 1881 - Clara Barton founded the American Red Cross.

39. 1884 - The installation of the Statue of Liberty in the United States was completed.

40. 1900 - The British, American, French, and German ministers in China again sent a note to the Qing government, urging it to severely suppress the Boxers and punish the officials who were ineffective in suppressing them.

41. 1902 - Zhang Zhidong founded the Hubei Normal School, which laid the foundation for training primary and secondary school teachers and promoted the development of education in Hubei.

42. 1920 - Venustiano Carranza, the first president of Mexico, passed away.

43. 1927 - Charles A. Lindbergh landed his "Spirit of St. Louis" near Paris, completing the first solo airplane flight across the Atlantic Ocean.

44. 1927 - Xu Kexiang launched the "May 21st Incident" in Changsha. A large number of Communist Party members and revolutionary masses were killed, and the revolutionary cause was seriously damaged.

45. 1944 - The enlarged Seventh Plenary Session of the Sixth Central Committee of the Communist Party of China opened in Yangjialing, Yan'an.

46. 1946 - Miao Bin, the go - between for Chiang Kai - shek and Japan, was executed.

47. 1951 - China established diplomatic relations with Pakistan.

48. 1956 - The United States exploded the first airborne hydrogen bomb over Bikini Atoll in the Pacific.

49. 1972 - Michelangelo's masterpiece Pietà was damaged in St. Peter's Basilica in the Vatican.

50. 1991 - Rajiv Gandhi, the former prime minister of India, was assassinated during the national elections by a suicide bomber.