Battle of Lechfeld: Otto I, Holy Roman Emperor defeats the Magyars, ending 50 years of Magyar invasion of the West.

The Battle of Lechfeld also known as the Second Battle of Lechfeld was a series of military engagements over the course of three days from 10–12 August 955 in which the Kingdom of Germany, led by King Otto I the Great, annihilated the Hungarian army led by Harka Bulcsú and the chieftains Lél and Súr. With the German victory, further invasions by the Magyars into Latin Europe were ended.

Otto I, known as Otto the Great or Otto of Saxony, was East Frankish (German) king from 936 and Holy Roman Emperor from 962 until his death in 973. He was the eldest son of Henry the Fowler and Matilda of Ringelheim.

Hungarians, also known as Magyars, are an ethnic group native to Hungary, who share a common culture, language and history. They also have a notable presence in former parts of the Kingdom of Hungary. The Hungarian language belongs to the Ugric branch of the Uralic language family, alongside the Khanty and Mansi languages.