Editing Valentinian I (section)

{{short description|Roman emperor from 364 to 375}}
{{Use dmy dates|date=August 2022}}
{{Infobox royalty
| name         = Valentinian the Great
| image        = Gold Solidus of Valens, Antioch.jpg
| image_size   = 
| alt          = Gold coin depicting a man with diadem facing right
| caption      = [[Solidus (coin)|''Solidus'']] of Valentinian marked: {{Smallcaps|{{Abbreviation|d·n·|DOMINUS NOSTER}} valentinianus {{Abbreviation|p·f·|PIUS FELIX}} {{Abbreviation|aug·|AUGUSTUS}}}}
| succession   = [[Roman emperor]]
| moretext     = (in the [[Western Roman Empire|West]])
| reign        = 26 February 364 – {{nowrap|17 November 375}}
| predecessor  = [[Jovian (emperor)|Jovian]]
| successor    = [[Gratian]] and [[Valentinian II]]
| regent       = [[Valens]] (in the [[Eastern Roman Empire|East]])
| reg-type     = {{nowrap|Co-emperor}}
| birth_date   = 321
| birth_place  = Cibalae, [[Pannonia (Roman province)|Pannonia]], Roman Empire {{small|(now [[Vinkovci]], [[Croatia]])}}
| death_date   = 17 November 375 (aged 54)
| death_place  = Brigetio, [[Pannonia Valeria]] {{small|(now [[Szőny]], [[Hungary]])}}
| burial_place = 
| spouse       = [[Marina Severa]]<br/>[[Justina (empress)|Justina]]
| issue        = {{ubl|[[Gratian]]|[[Valentinian II]]|[[Galla (wife of Theodosius I)|Galla]]|Grata|Justa}}
| issue-link   = 
| issue-pipe   = 
| full name    = 
| regnal name  = [[Imperator]] [[Caesar (title)|Caesar]] [[Flavia gens|Flavius]] Valentinianus [[Augustus (title)|Augustus]]{{efn|The name "Flavius" only appears in two single inscriptions, and only abbreviated as "Fl".<ref>{{cite book |first1=Roger S. |last1=Bagnall |author-link=Roger S. Bagnall |first2=Alan |last2=Cameron |first3=Seth R. |last3=Schwartz |first4=Klaas A. |last4=Worp |author-link4=Klaas Worp |title=Consuls of the Later Roman Empire |publisher=American Philological Association |year=1987 |isbn=1-55540-099-X |pages=264–281}}</ref> By the late 4th century, "Flavius" had become a [[courtesy title]] used not only for emperors, but to all high-profile men, like the [[Roman consul]]s.<ref>{{Cite journal|last=Cameron|first=Alan|date=1988|title=Flavius: a Nicety of Protocol|url=https://www.jstor.org/stable/41540754|journal=Latomus|volume=47|issue=1|pages=26–33|jstor=41540754}}</ref>}}{{efn|The ''[[L'Année Épigraphique]]'' attests his full name as ''Flavius Julius Valentinianus''.<ref>{{Cite journal |date=1949 |title=Tables analytiques de la revue des publications épigraphiques |url=https://www.jstor.org/stable/25606700 |journal=[[L'Année épigraphique]] |volume= 1949|pages=88 |jstor=25606700 |issn=0066-2348}}</ref>}}
| dynasty      = [[Valentinianic dynasty|Valentinianic]]
| father       = [[Gratianus Funarius]]
| religion     = [[Nicene Christianity]]
}}

'''Valentinian I''' ({{langx|la|Valentinianus}}; 321{{snd}}17 November 375), also known as '''Valentinian the Great''', was [[Roman emperor]] from 364 to 375. He ruled the [[Western Roman Empire|Western]] half of the empire, while his brother [[Valens]] ruled the [[Byzantine Empire|East]]. During his reign, he fought successfully against the [[Alamanni]], [[Quadi]], and [[Sarmatians]], strengthening the border fortifications and conducting campaigns across the [[Rhine]] and [[Danube]]. His general [[Count Theodosius|Theodosius]] defeated a revolt in [[Africa (Roman province)|Africa]] and the [[Great Conspiracy]], a coordinated assault on [[Roman Britain]] by [[Picts]], [[Scoti]], and [[Saxons]]. Valentinian founded the [[Valentinian dynasty]], with his sons [[Gratian]] and [[Valentinian II]] succeeding him in the western half of the empire.