Biography

He was holding the office of notarius when, in 354, Emperor Constantius II

Constantius II

Constantius II , was Roman Emperor from 337 to 361. The second son of Constantine I and Fausta, he ascended to the throne with his brothers Constantine II and Constans upon their father's death....

 ordered him, Eusebius

Eusebius (praepositus sacri cubiculi)

Eusebius was a high-ranking officer of the Roman Empire, holding the position of praepositus sacri cubiculi for all the rule of Emperor Constantius II .- Biography :...

 and Mallobaudes

Mallobaudes

Mallobaudes or Mellobaudes was a 4th-century Frankish king who also held the Roman title of comes domesticorum.In 354 he was a tribunus armaturarum in the Roman army in Gaul, where he served under Silvanus, who usurped power in 355. Malobaudes tried unsuccessfully to intervene on his behalf...

 to interrogate Constantius Gallus

Constantius Gallus

Flavius Claudius Constantius Gallus , commonly known as Constantius Gallus, was a member of the Constantinian dynasty and Caesar of the Roman Empire . Gallus was consul three years, from 352 to 354.- Family :...

, formerly Caesar

Caesar (title)

Caesar is a title of imperial character. It derives from the cognomen of Julius Caesar, the Roman dictator...

 of the East and cousin of Constantius II, while he was held prisoner in Pula

Pula

Pula is the largest city in Istria County, Croatia, situated at the southern tip of the Istria peninsula, with a population of 62,080 .Like the rest of the region, it is known for its mild climate, smooth sea, and unspoiled nature. The city has a long tradition of winemaking, fishing,...

, asking him reason for each man he had put to death. Gallus was sentenced to death and Serenianus

Serenianus

Serenianus was an officer of the Roman Empire, involved in the death of Caesar Constantius Gallus and in the usurpation of Procopius.- Biography :...

, Apodemius

Apodemius

Apodemius was an officer of the Roman Empire, a courtier of Emperor Constantius II, involved in the deaths of Constantius Gallus and Claudius Silvanus.- Biography :...

 and Pentadius executed him.

In 358 Pentadius was raised to the rank of magister officiorum

Magister officiorum

The magister officiorum was one of the most senior administrative officials in the late Roman Empire and the early centuries of the Byzantine Empire...

of the new Caesar of the West Julian

Julian the Apostate

Julian "the Apostate" , commonly known as Julian, or also Julian the Philosopher, was Roman Emperor from 361 to 363 and a noted philosopher and Greek writer....

, brother of Gallus, whom he followed in Gaul

Gaul

Gaul was a region of Western Europe during the Iron Age and Roman era, encompassing present day France, Luxembourg and Belgium, most of Switzerland, the western part of Northern Italy, as well as the parts of the Netherlands and Germany on the left bank of the Rhine. The Gauls were the speakers of...

. Pentadius, however, opposed Julian; together with Paulus Catena

Paulus Catena

Paulus was the name of an imperial notary, or senior civil servant, who served under the Roman Emperor Constantius II in the middle of the 4th century. He is described by the historian Ammianus Marcellinus, who probably met him. According to Marcellinus, his cruelty was infamous throughout the...

 and Gaudentius  he had Sallustius

Sallustius

Sallustius or Sallust was a 4th-century Latin writer, a friend of the Roman Emperor Julian. He wrote the treatise On the Gods and the Cosmos, a kind of catechism of 4th-century Hellenic paganism. Sallustius' work owes much to that of Iamblichus of Chalcis, who synthesized Platonism with...

, a friend and a collaborator of Julian's, removed from his office. In 360, together with Nebridius and Decentius

Decentius (magister officiorum)

Decentius was an officer of the Roman Empire; he played a role in the acclamation of Julian as emperor against Constantius II in Paris .- Biography :In 360 he was tribunus et notarius...

, he suggested Julian to obey Constantius, who had asked to his caesar to send him back his best troops; when the troops who did not want to leave Gaul for the eastern front acclaimed Julian emperor, Pentadius and Euterius were sent to bring Constantius some letters announcing the events.

In 361, Julian became the only Emperor; after entering Constantinople

Constantinople

Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

, he formed the Chalcedon tribunal

Chalcedon tribunal

Shortly after the death of Roman emperor Constantius II, his successor Julian the Apostate held a tribunal at the city of Chalcedon, which was then a suburb of Constantinople...

to put under trial Constantius' officers; Pentadius was accused for his involvement in Gallus' trial and death, but was found not guilty.