Eastern Roman
The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived the events that caused the fall of the Western Roman E ...
military commander whose recorded career flourished in the
Caucasus
The Caucasus () or Caucasia (), is a region spanning Eastern Europe and Western Asia. It is situated between the Black Sea and the Caspian Sea, comprising parts of Southern Russia, Georgia, Armenia, and Azerbaijan. The Caucasus Mountains, i ...
region c. 369–374. He served the Roman Emperor
Valens
Valens (; ; 328 – 9 August 378) was Roman emperor from 364 to 378. Following a largely unremarkable military career, he was named co-emperor by his elder brother Valentinian I, who gave him the Byzantine Empire, eastern half of the Roman Em ...
as ''comes rei militaris'' (military commander), most notably in the East.
Terentius first appears as ''
dux
''Dux'' (, : ''ducēs'') is Latin for "leader" (from the noun ''dux, ducis'', "leader, general") and later for duke and its variant forms (doge, duce, etc.). During the Roman Republic and for the first centuries of the Roman Empire, ''dux'' coul ...
'' in undated tiles from
Aquincum
Aquincum (, ) was an ancient city, situated on the northeastern borders of the province of Pannonia within the Roman Empire. The ruins of the city can be found in Budapest, the capital city of Hungary. It is believed that Marcus Aurelius wrote ...
comes
''Comes'' (plural ''comites''), translated as count, was a Roman title, generally linked to a comitatus or comital office.
The word ''comes'' originally meant "companion" or "follower", deriving from "''com-''" ("with") and "''ire''" ("go"). Th ...
'' and ''dux'', being in command of the expedition that reinstated Pap as
king of Armenia
This is a list of the monarchs of Armenia, rulers of the ancient Kingdom of Armenia (antiquity), Kingdom of Armenia (336 BC – AD 428), the medieval Bagratid Armenia, Kingdom of Armenia (884–1045), various lesser Armenian kingdoms (908–1170) ...
in 370. That same year, with twelve legions Terentius helped Sauromaces to reclaim the throne of
Iberia
The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, compri ...
from Aspacures, Sauromaces' cousin and a
Sasanian
The Sasanian Empire (), officially Eranshahr ( , "Empire of the Iranians"), was an Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, the length of the Sasanian dynasty's reign ...
client. In 373 or 374 Terentius urged the emperor
Valens
Valens (; ; 328 – 9 August 378) was Roman emperor from 364 to 378. Following a largely unremarkable military career, he was named co-emperor by his elder brother Valentinian I, who gave him the Byzantine Empire, eastern half of the Roman Em ...
to replace Pap with a more amenable person in order to prevent Armenia from falling into Sasanian hands and, subsequently, lost Pap's confidence. In 375, Terentius appears retired and residing at
Antioch
Antioch on the Orontes (; , ) "Antioch on Daphne"; or "Antioch the Great"; ; ; ; ; ; ; . was a Hellenistic Greek city founded by Seleucus I Nicator in 300 BC. One of the most important Greek cities of the Hellenistic period, it served as ...
. It is not clear whether Terentius is the same commander mentioned in 373 as attacking the
Albanians
The Albanians are an ethnic group native to the Balkan Peninsula who share a common Albanian ancestry, Albanian culture, culture, Albanian history, history and Albanian language, language. They are the main ethnic group of Albania and Kosovo, ...
and Iberians.
Terentius was a devoted
Christian
A Christian () is a person who follows or adheres to Christianity, a Monotheism, monotheistic Abrahamic religion based on the life and teachings of Jesus in Christianity, Jesus Christ. Christians form the largest religious community in the wo ...
. When asked by Valens what reward he would choose for his services, Terentius requested—to the emperor's ire—that a church be given for the use of the orthodox Christians. His daughters were nuns at
Samosata
Samsat (, Ottoman Turkish صمصاد ''Semisat''), formerly Samosata () is a small town in the Adıyaman Province of Turkey, situated on the upper Euphrates river. It is the seat of Samsat District.