Wikipedia:Selected anniversaries/September 18

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 * 324 – Constantine the Great decisively defeated Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire and ending the Tetrarchy.
 * 1048 – Byzantine–Seljuk wars: Byzantine forces defeated their Seljuk opponents in the flanks of the nocturnal Battle of Kapetron, but learned of their Georgian allies' defeat in the centre the next morning.
 * 1850 – The United States Congress passed the Fugitive Slave Act, decreeing that all escaped slaves be brought back to their masters.
 * 1851 – The New York Times, the largest metropolitan newspaper in the United States, was founded.
 * 1870 – Nathaniel P. Langford of the Washburn–Langford–Doane Expedition first observed a geyser in the Wyoming Territory erupting at regular intervals, naming it Old Faithful (video featured).
 * 1873 – Panic of 1873: The American bank Jay Cooke & Company declared bankruptcy, setting off a chain reaction of bank failures.
 * 1879 – The Blackpool Illuminations (example pictured) in the English seaside town of Blackpool were switched on for the first time.
 * 1895 – Daniel David Palmer performed the first chiropractic adjustment, on deaf janitor Harvey Lillard.
 * 1918 – World War I: The Central Powers' defeat at the Battle of Dobro Pole played a role in the Bulgarian withdrawal from the war and led to the subsequent liberation of Vardar Macedonia.
 * 1948 – The Australian cricket team's Invincibles tour of England concluded; they had played 34 matches, including five Tests, without defeat.
 * 2001 – Five letters containing anthrax spores were mailed to various media outlets in the United States.
 * Born/died this day: | Andronikos Komnenos |b|1091| Henry Stafford, 1st Baron Stafford |b|1501| Zhang Xianzhong |b|1606| André Dacier |d|1722| William Hazlitt |d|1830| Kate Booth |b|1858| Helene Scheu-Riesz |b|1880| Toni Wolff |b|1888|  Edwin McMillan |b|1907| Blue Panther |b|1960| Lewis Holtby |b|1990| Sol Campbell |b|1974| Christian Pulisic |b|1998| Jamey Rodemeyer |d|2011 |Haim Hefer |d|2012