📅 Today in HistorySeptember 18

Emperor Domitian is assassinated as a result of a plot by his wife Domitia and two Praetorian prefects. Nerva is then proclaimed as his successor.

Constantine the Great decisively defeats Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.

Battle of Kapetron between a combined Byzantine-Georgian army and a Seljuq army.

Norwegian king Harald Hardrada lands with Tostig Godwinson at the mouth of the Humber River and begins his invasion of England.

Philip Augustus becomes king of France at the age of fifteen.

Thirteen Years' War: In the Battle of Chojnice, the Polish army is defeated by the Teutonic knights.

The expedition of Juan Bautista Pastene makes landfall in San Pedro Bay, southern Chile, claiming the territory for Spain.

The twelfth baktun in the Mesoamerican Long Count calendar begins.

George I arrives in Great Britain after becoming king on August 1.

The Treaty of Belgrade is signed, whereby Austria cedes lands south of the Sava and Danube rivers to the Ottoman Empire.