Valentinian I (Latin: Flavius Valentinianus Augustus; 321 – 17 November 375) also known as Valentinian the Great was Roman emperor from 364 to 375. Upon becoming emperor he made his brother Valens his co-emperor giving him rule of the eastern provinces while Valentinian retained the west.During his reign Valentinian fought successfully against the Alamanni Quadi and Sarmatians. Most notable was his victory over the Alamanni in 367 at the Battle of Solicinium.
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