Day In History
This Day in History
Today: April 9, 2026
193
The distinguished soldier Septimius Severus is proclaimed emperor by the army in Illyricum.[1]
475
Byzantine Emperor Basiliscus issues a circular letter (Enkyklikon) to the bishops of his empire, supporting the Monophysite christological position.[2]
537
Siege of Rome: The Byzantine general Belisarius receives his promised reinforcements, 1,600 cavalry, mostly of Hunnic or Slavic origin and expert bowmen. He starts, despite shortages, raids against the Gothic camps and Vitiges but is forced into a stalemate.
1241
Battle of Liegnitz: Mongol forces defeat the Polish and German armies.[3]
1288
Mongol invasions of Vietnam: Yuan forces are defeated by Trần forces in the Battle of Bach Dang in present-day northern Vietnam.[4]
1388
Despite being outnumbered 16:1, forces of the Old Swiss Confederacy are victorious over the Archduchy of Austria in the Battle of Näfels.[5]
1454
The Treaty of Lodi is signed, establishing a balance of power among northern Italian city-states for almost 50 years.[6]
1609
Eighty Years' War: Spain and the Dutch Republic sign the Treaty of Antwerp to initiate twelve years of truce.
1609
Philip III of Spain issues the decree of the "Expulsion of the Moriscos".
1682
Robert Cavelier de La Salle discovers the mouth of the Mississippi River, claims it for France and names it Louisiana.
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