| 87901 | August 3 | Holiday and observance | Christian feast day:George Freeman Bragg, W. E. B. Du Bois (Episcopal Church)Lydia of ThyatiraMyrrhbearers (Lutheran Church)NicodemusOlaf II of Norway (Translation of the relic)Stephen (Discovery of the relic)Waltheof of MelroseAugust 3 (Eastern Orthodox |
| 87902 | August 3 | Holiday and observance | Esther Day (United States) |
| 87903 | August 3 | Holiday and observance | Flag Day (Venezuela) |
| 87904 | August 3 | Holiday and observance | Independence Day, celebrates the independence of Niger from France in 1960. |
| 87905 | August 3 | Holiday and observance | National Guard Day (Venezuela) |
| 87906 | August 4 | Event | 367 – Gratian, son of Roman Emperor Valentinian I, is named co-Augustus by his father and associated to the throne aged eight. |
| 87907 | August 4 | Event | 598 – Goguryeo-Sui War: Emperor Wéndi of Sui orders his youngest son, Yang Liang (assisted by the co-prime minister Gao Jiong), to conquer Goguryeo (Korea) during the Manchurian rainy season, with a Chinese army and navy. |
| 87908 | August 4 | Event | 1265 – Second Barons' War: Battle of Evesham: The army of Prince Edward (the future king Edward I of England) defeats the forces of rebellious barons led by Simon de Montfort, 6th Earl of Leicester, killing de Montfort and many of his allies. |
| 87909 | August 4 | Event | 1327 – First War of Scottish Independence: James Douglas leads a raid into Weardale and almost kills Edward III of England. |
| 87910 | August 4 | Event | 1532 – The Duchy of Brittany is united to the Kingdom of France. |
| 87911 | August 4 | Event | 1578 – Battle of Al Kasr al Kebir: The Moroccans defeat the Portuguese. King Sebastian of Portugal is killed in the battle, leaving his elderly uncle, Cardinal Henry, as his heir. This initiates a succession crisis in Portugal. |
| 87912 | August 4 | Event | 1693 – Date traditionally ascribed to Dom Perignon's invention of champagne, however it is not clear whether he actually invented champagne, however he has been credited as an innovator who developed the techniques used to perfect sparkling wine. |
| 87913 | August 4 | Event | 1704 – War of the Spanish Succession: Gibraltar is captured by an English and Dutch fleet, commanded by Admiral Sir George Rooke and allied with Archduke Charles. |
| 87914 | August 4 | Event | 1783 – Mount Asama erupts in Japan, killing about 1,400 people. The eruption causes a famine, which results in an additional 20,000 deaths. |
| 87915 | August 4 | Event | 1789 – In France members of the National Constituent Assembly take an oath to end feudalism and abandon their privileges. |
| 87916 | August 4 | Event | 1790 – A newly passed tariff act creates the Revenue Cutter Service (the forerunner of the United States Coast Guard). |
| 87917 | August 4 | Event | 1791 – The Treaty of Sistova is signed, ending the Ottoman–Habsburg wars. |
| 87918 | August 4 | Event | 1796 – French Revolutionary Wars: Napoleon leads the French Army of Italy to victory in the Battle of Lonato. |
| 87919 | August 4 | Event | 1821 – The Saturday Evening Post is published for the first time as a weekly newspaper. |
| 87920 | August 4 | Event | 1824 – The Battle of Kos is fought between Turkish and Greek forces. |
| 87921 | August 4 | Event | 1854 – The Hinomaru is established as the official flag to be flown from Japanese ships. |
| 87922 | August 4 | Event | 1863 – Matica slovenská, Slovakia's public-law cultural and scientific institution focusing on topics around the Slovak nation, is established in Martin. |
| 87923 | August 4 | Event | 1873 – American Indian Wars: While protecting a railroad survey party in Montana, the United States 7th Cavalry, under Lieutenant Colonel George Armstrong Custer clashes for the first time with the Cheyenne and Lakota people near the Tongue River only one |
| 87924 | August 4 | Event | 1889 – The Great Fire of Spokane, Washington destroys some 32 blocks of the city, prompting a mass rebuilding project. |
| 87925 | August 4 | Event | 1892 – The father and stepmother of Lizzie Borden are found murdered in their Fall River, Massachusetts home. |
| 87926 | August 4 | Event | 1902 – The Greenwich foot tunnel under the River Thames opens. |
| 87927 | August 4 | Event | 1906 – Central railway station, Sydney opens. |
| 87928 | August 4 | Event | 1914 – World War I: Germany invades Belgium. In response, Belgium and the United Kingdom declare war on Germany. The United States declares its neutrality. |
| 87929 | August 4 | Event | 1915 – World War I: The German 12th Army occupies Warsaw during the Gorlice–Tarnów Offensive and the Great Retreat of 1915. |
| 87930 | August 4 | Event | 1924 – Diplomatic relations between Mexico and the Soviet Union are established. |