Flavius Valentinianus Augustus, also known as Valentinian the Great, was Roman emperor from 364 to 375. Upon becoming emperor he made his brother Valens co-emperor, giving him rule of the east while Valentinian retained the west.
Valentinian fought successfully against the Alamanni, Quadi, and Sarmatians. His brilliant general Count Theodosius defeated a revolt in Africa and the Great Conspiracy, a coordinated assault on Roman Britain by Picts, Scots, and Saxons. He rebuilt and improved the fortifications along the frontiers, even building fortresses in enemy territory.
He is often considered to be the "last great western emperor", and founded the Valentinian Dynasty, with his sons Gratian and Valentinian II succeeding him in the western half of the empire.
Valentinian fought successfully against the Alamanni, Quadi, and Sarmatians. His brilliant general Count Theodosius defeated a revolt in Africa and the Great Conspiracy, a coordinated assault on Roman Britain by Picts, Scots, and Saxons. He rebuilt and improved the fortifications along the frontiers, even building fortresses in enemy territory.
He is often considered to be the "last great western emperor", and founded the Valentinian Dynasty, with his sons Gratian and Valentinian II succeeding him in the western half of the empire.

(1)
Valentinian I
365
Obverse:
DN VALENTINIANVS PF AVG,
Reverse:
SECVRITAS REIPUBLICAE, Victory advancing left holding wreath and palm, D in left field
(2)
Valentinian I
AD 367
Obverse:
DN VALENTINIANUS PF AVG, Diademed, draped and cuirrassed bust right
Reverse:
GLORIA ROMANORVM, Valentininan in military attire advancing right, head left, dragging captive by the hair with right hand and holding labarum in left hand, R in right field
(3)
Valentinian I
364-367 AD
Obverse:
DN VALENTINIANUS PF AVG, Diademed, draped and cuirrassed bust right
Reverse:
GLORIA ROMANORVM, Valentininan in military attire advancing right, head left, dragging captive by the hair with right hand and holding labarum in left hand * A in right field
(4)
Valentinian I
367-375 AD
Obverse:
DN VALENTINIANUS PF AVG, Diademed, draped and cuirrassed bust right
Reverse:
GLORIA ROMANORVM, Valentininan in military attire advancing right, head left, dragging captive by the hair with right hand and holding labarum in left hand. *F in right field, M in left field.
(5)
Valentinian I
367 AD
Obverse:
DN VALENTINIANVS PF AVG, diademed, draped and cuirassed bust right
Reverse:
SECVRITAS REIPVBLICAE, Victory advancing left holding wreath and palm, R in left field
(6)
Valentinian I
AD 366
Obverse:
D N VALENTINIANVS P F AVG, diademed, draped and cuirassed bust right
Reverse:
RESTITVTOR REI P, Valentinian, in military attire, standing facing, head right, holding labarum and Victory on globe; SLVG• in exergue
(7)
Valentinian I
367-375 A.D.
Obverse:
DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right
Reverse:
GLORIA RO-MANORVM, Emperor in military dress, walking right, head left, holding labarum, dragging captive behind him. Left field: S. Right field: D. Mintmark: BSISC.
(8)
Valentinian I
367-375 A.D.
Obverse:
DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right.
Reverse:
SECVRITAS-REIPVBLICAE, Victory advancing left, holding wreath and palm.
(9)
Valentinian I
364-375 A.D.
Obverse:
DN VALENTINI-ANVS PF AVG, pearl diademed, draped, cuirassed bust right
Reverse:
GLORIA RO-MANORVM, Emperor in military dress, walking right, head left, holding labarum, dragging captive behind him.
(10)
Valentinian I
364-367 AD
Obverse:
pearl-diademed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Valens advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / ASISC
(11)
Valentinian I
364-367 AD
Obverse:
pearl-diademed, draped and cuirassed bust right; D N VALENTI_NIANVS P F AVG
Reverse:
Valens advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / OF _ II / CONST
(12)
Valentinian I
364-367 AD
Obverse:
pearl-diademed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Valens advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / wreath / TES{A,B}
(13)
Valentinian I
367-375 AD
Obverse:
pearl-diademed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Victory advancing left, holding wreath and palm; SECVRITAS__REIPVBLICAE / D / *ΔSISC
(14)
Valentinian I
364-367 AD
Obverse:
pearl-diademed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Valentinian advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / * / A / ·ΓSISC
(15)
Valentinian I
367-375 AD
Obverse:
draped and cuirassed pearl-diademed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Victory holding wreath and palm branch; SECVRITAS__REIPVBLICAE / * over D _ S / ΔSISC
(16)
Valentinian I
364-367 AD
Obverse:
pearl-didemed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Victory advancing left, holding wreath and palm; SECVRITAS__REIPVBLICAE / DΔSISC
(17)
Valentinian I
367-375 AD
Obverse:
pearl-didemed, draped and cuirassed bust right; D N VALENTINI_ANVS P F AVG
Reverse:
Valentinian I advancing right, dragging captive and holding labarum; GLORIA RO_MANORVM / D / *BSISC
(18)
Valentinian I
367-375 AD
Obverse:
DN VALENTINIANVS P F AVG, Bust of Valentinian facing right, wearing pearl diadem, cuirass, and drapery
Reverse:
RESTITVTOR REIPVBLICAE, Valentinian standing, looking right, in military dress, holding labarum and Victory on globe; SMNA in exergue