The Juthungi (German: Juthungen, Greek: Iouthungi, Latine: Iuthungi) were an Alemannic tribe in the region north of the rivers Danube and Altmühl in the modern state of Bavaria.

The tribe was mentioned by the Roman historian Ammianus Marcellinus. The meaning of their name is “descendants”, and refers to the ancient Suebian tribe of the Semnoni.

The Juthungi invaded Italy in 259/260, but were defeated on 24th–25th April 260 on their way back near Augsburg by Marcus Simplicinius Genialis (this is recorded on a Roman memorial stone found in 1992). At this time the Roman Empire lost the Limes area in this region. Between 356 and 358 the Juthungi and the Alamanni invaded the province of Raetia, and destroyed Castra Regina (the Roman capital of the province, and one of the biggest Roman military camps in south Germany, with massive stone walls and a village). A second invasion of Raetia in 383 was repelled by an army of Alans and Huns. Between 429 and 431 the Roman general Aetius also fought against the Juthungi in Raetia.

Historical Sources

• Roman memorial stone near Augsburg (around 260)
• Dexippos - FGrHist 100 (around 270/271)
• Panex Latini VIII 10.4 (around 297)
• Ammianus Marcellinus 17,6 (around 375)
• Sidonius Apollinaris, c. 7, 233 (around 429/430)