Theodoric I

King of the Visigoths, the son of Alaric I, elected king in 418. Alternately an ally and an enemy of Rome, in 421 (or 422) he treacherously joined the Vandals and attacked the Roman troops from behind. In 435 he attacked the Romans in Gaul and besieged Narbonne. Forced to retreat to Toulouse, he there defeated a Roman army (439). On the invasion of Attila in 451, he joined the Romans, under Aëtius, and at Troyes commanded the right wing. He drove back the Huns under Attila, but was killed.

Theodoric I, sometimes called Theodorid and in Spanish and Italian Teodorico, was the King of the Visigoths from 419–451.

As king he completed the settlement of the Visigoths in Aquitaine and expanded his realm into Hispania. The most renowned event in his reign was the Battle of Chalons, where he assisted Aëtius in forcing Attila the Hun to retreat and abandon his campaign to ransack the western empire. Theodoric's son and later successor, Thorismund, took over the Visigothic army in his father's stead and helped win the day.