Battle on the Elster
1080 CE.
Shown on the map at 51.167°, 12.152°.
Battle on the Elster (German: Schlacht bei Hohenmölsen) was the third and last battle between the Salian king Henry IV of Germany and anti-king Rudolf of Rheinfelden, fought on October 14, 1080 near Hohenmölsen on the White Elster river. Rudolf's forces were victorious; however, he was mortally wounded and succumbed to his injuries the next day.
Text from the Wikipedia article Battle on the Elster, licensed CC BY-SA 4.0.