Some Byzantine coins from various emperors.

Full name: Flavius Petrus Sabbatius Iustinianus Life span: AD 482-565 Justinian built the great church of Hagia Sophia in Constantinople, had codified a set of laws, and expanded the empire by conquests.

Gold, 21 mm, 4.43 gm
Struck: AD 527-537 Constantinople
Obverse:
Helmeted and cuirassed head facing 3/4 right, holding spear over shoulder and shield
DN IVSTINI-ANVS PP AVG
Reverse:
Victory standing facing, holding jeweled cross and cross on globe, star in right field
VICTORI - A AVGGG B (Oficina B)
CONOB in exergue

Bronze, 30 mm, 17.98 gm
Struck: AD 527-538 Constantinople
Obverse:
Diademed, draped, and cuirassed head facing right
D N IVSTINI-ANVS PP AVG
Reverse:
Large letter "M", star left, cross top, cross right, Γ under large "M"
CON in exergue

Full name: Flavius Heraclius Augustus Life span: AD 575-641 Heraclius made Greek the official language of the empire and was the first emperor to face the Islamic conquests.

Gold, 22 mm, 4.46 gm
Struck: AD 610-613 Constantinople
Obverse:
dN hERACLI-VS PP AVG
Head facing front with short beard and moustache, wearing plumed helmet and cloak, holding a cross
Reverse:
VICTORIA AVGu E (The E is officina of the mint)
Cross potent on three steps, CONOB below

Gold, 20 mm, 4.31 gm
Struck: AD 639-641 Constantinople
Obverse:
Left to right Heraclonas, Heraclius, and Heraclius Constantine facing, all wearing wearing
plumed helmets and cloaks and holding crosses
Reverse:
VICTORIA AVGu G (The G is the officina of the mint)
Cross potent on three steps, Heraclian monogram left, CONOB below

Full name: Basileios II Boulgaroktonos Life span: AD 958-1025 These coins are called "anonymous" because they do not have the name of the emperor on them.

Bronze, 30 mm, 15.19 gm
Struck: AD 976-1028
Obverse:
Christ facing front wearing halo and holding book of gospels, adornments above and below
[+EMMANOVHA IX-XC]
Reverse:
+IhSUS / XRISTUS / bASILEU / bASILE in four lines

Full name: Alexius Comnenus Life span: AD 1056-1118 These coins are called "anonymous" because they do not have the name of the emperor on them.

Bronze, 14x24 mm, 2.96 gm
Struck: AD 1081-1085 Constantinople
Obverse:
Christ facing front with cross behind head, gospels in left hand
Reverse:
Cross with globule and pellets

Full name: John II Komnenos Life span: AD 1087-1143

Gold, 27 x 25 mm, 4.18 gm
Struck: AD 1122-1137, Constantinople
Obverse:
Christ on throne holding book of gospels
ΚΕRΟ ΙC ΧC ΗΘΕΙ (C and R are alternate ways of writing Σ and Ρ)
ΚΕRΟ is Κυριος, Kyrios or Kyrie (Lord)
ΙC ΧC is an abbreviation for Ιησους Χριστος or Jesus Christ
ΗΘΕΙ is help or aid
Reverse:
Emperor left being crowned by Mary right
Left: ΙΩ ΔΕCΠΟΤΗC Top: VΘ Right: ΜΡ (V is an alternate way of writing Υ)
ΙΩ is Ιωαννης, Ioannis or John
ΔΕCΠΟΤΗC is Despotes or Lord, Master
The top and right VΘ ΜΡ is a rearrangement of ΜΡ ΘΥ.
ΜΡ ΘΥ is an abbreviation for Μητηρ Θεου, Meter Theou, or Mother of God