19 July

64 – Great Fire of Rome: a fire begins to burn in the merchant area of Rome and soon burns completely out of control. According to a popular, but untrue legend, Nero fiddled as the city burned.
484 – Leontius, Roman usurper, is crowned Eastern emperor at Tarsus (modern Turkey). He is recognized in Antioch and makes it his capital.
711 – Umayyad conquest of Hispania: Battle of Guadalete – Umayyad forces under Tariq ibn Ziyad defeat the Visigoths led by King Roderic.
1333 – Wars of Scottish Independence: Battle of Halidon Hill – The English win a decisive victory over the Scots.
1544 – Italian War of 1542: the first Siege of Boulogne begins.
1545 – The Tudor warship Mary Rose sinks off Portsmouth; in 1982 the wreck is salvaged in one of the most complex and expensive projects in the history of maritime archaeology.
1553 – Lady Jane Grey is replaced by Mary I of England as Queen of England after only nine days of reign.
1588 – Anglo-Spanish War: Battle of Gravelines – The Spanish Armada is sighted in the English Channel.
1701 – Representatives of the Iroquois Confederacy sign the Nanfan Treaty, ceding a large territory north of the Ohio River to England.
1702 – Great Northern War: A numerically superior Polish-Saxon army of Augustus II the Strong, operating from an advantageous defensive position, is defeated by a Swedish army half its size under the command of King Charles XII in the Battle of Klissow.
1832 – The British Medical Association is founded as the Provincial Medical and Surgical Association by Sir Charles Hastings at a meeting in the Board Room of the Worcester Infirmary.
1843 – Brunel's steamship the SS Great Britain is launched, becoming the first ocean-going craft with an iron hull or screw propeller and also becoming the largest vessel afloat in the world.
1848 – Women's rights: a two-day Women's Rights Convention opens in Seneca Falls, New York; there the "Bloomers" are introduced.
1863 – American Civil War: Morgan's Raid – At Buffington Island in Ohio, Confederate General John Hunt Morgan's raid into the north is mostly thwarted when a large group of his men are captured while trying to escape across the Ohio River.
1864 – Taiping Rebellion: Third Battle of Nanking – The Qing Dynasty finally defeats the Taiping Heavenly Kingdom.
1870 – Franco-Prussian War: France declares war on Prussia.
1900 – The first line of the Paris Métro opens for operation.
1908 – Dutch football club Feyenoord was founded
1916 – World War I: Battle of Fromelles – British and Australian troops attack German trenches in a prelude to the Battle of the Somme.
1919 – Following Peace Day celebrations marking the end of World War I, ex-servicemen riot and burn down Luton Town Hall.
1940 – World War II: Battle of Cape Spada – The Royal Navy and the Regia Marina clash; the Italian light cruiser Bartolomeo Colleoni sinks, with 121 casualties.
1940 – World War II: Army order 112 forms the Intelligence Corps of the British Army.
1942 – World War II: Battle of the Atlantic – German Grand Admiral Karl Dönitz orders the last U-boats to withdraw from their United States Atlantic coast positions in response to the effective American convoy system.
1947 – The Prime Minister of the shadow Burmese government, Bogyoke Aung San and 6 of his cabinet and 2 non-cabinet members are assassinated by Galon U Saw.
1947 – Korean politician Yuh Woon-Hyung is assassinated.
1961 – Tunisia imposes a blockade on the French naval base at Bizerte; the French would capture the entire town four days later.
1963 – Joe Walker flies a North American X-15 to a record altitude of 106,010 metres (347,800 feet) on X-15 Flight 90. Exceeding an altitude of 100 km, this flight qualifies as a human spaceflight under international convention.
1964 – Vietnam War: at a rally in Saigon, South Vietnamese Prime Minister Nguyen Khanh calls for expanding the war into North Vietnam.
1972 – Dhofar Rebellion: British SAS units help the Omani government against Popular Front for the Liberation of Oman rebels in the Battle of Mirbat.
1976 – Sagarmatha National Park in Nepal is created.
1979 – The Sandinista rebels overthrow the government of the Somoza family in Nicaragua.
1981 – In a private meeting with U.S. President Ronald Reagan, French Prime Minister François Mitterrand reveals the existence of the Farewell Dossier, a collection of documents showing that the Soviets had been stealing American technological research and development.
1983 – The first three-dimensional reconstruction of a human head in a CT is published.
1985 – The Val di Stava dam collapses killing 268 people in Val di Stava, Italy.
1989 – United Airlines flight 232 crashes in Sioux City, Iowa killing 112 of the 296 passengers.
1992 – A car bomb placed by mafia with collaboration of Italian intelligence kills judge Paolo Borsellino and five members of his escort
1997 – The Troubles: The Provisional Irish Republican Army resumes a ceasefire to end their 25-year campaign to end British rule in Northern Ireland.

Holidays and observances

Burmese Martyrs' Day (Burma)
Christian Feast Day:
Arsenius (Roman Catholic Church)
Bernold, Bishop of Utrecht
Justa and Rufina
Kirdjun
Macrina the Younger, Sister of St. Basil the Great
Symmachus
July 19 (Eastern Orthodox liturgics)
Sandinista Day or Liberation Day (Nicaragua)