Late Ordovician Mass Extinction: The First of the Big Five
An estimated 85% of marine species died out in two pulses, but the main Paleozoic groups survived and recovered in the Silurian.
Every Chronicle article on world history, newest first: battles, empires, disasters, discoveries and revolutions.
An estimated 85% of marine species died out in two pulses, but the main Paleozoic groups survived and recovered in the Silurian.
Decisive Allied victory; the Axis Panzer Army Africa was driven out of Egypt and began a retreat that ended with its surrender in Tunisia in May 1943.
German forces won the largest advances on the Western Front since 1914 but failed to break the Allies, and the losses left Germany unable to resist the Allied counter-offensives.
The General Act of Berlin set rules for new claims on African coasts, declared free trade in the Congo basin and smoothed recognition of Leopold II's Congo.
Union victory; Lee's Army of Northern Virginia was repulsed with heavy losses and retreated to Virginia, ending its second invasion of the North.
The bridge opened as the longest suspension bridge in the world and the first to use steel wire for its cables, linking New York and Brooklyn.
Slavery was abolished in most of the British Empire from 1 August 1834, followed by an apprenticeship system that ended in 1838, with 20 million pounds paid to slave owners.
Restored to the throne of Texcoco, Nezahualcoyotl made his city a partner in the Aztec Triple Alliance and its leading centre of law, learning and the arts.
Rumfa turned Kano into a walled Islamic commercial capital with a new palace, a central market and royal institutions that lasted for centuries.
Timur defeated the Tughluq army and sacked Delhi; the Delhi Sultanate was left fragmented and the Tughluq dynasty soon ended.
A brick pagoda clad in brown glazed tiles replaced an earlier wooden tower and has survived nearly a thousand years of floods, earthquakes and war.
Al-Biruni produced the most detailed medieval account of Indian religion, science and society, and an estimate of the Earth's radius close to the modern value.