Flavius Syagrius was the

consul Consul (abbrev. ''cos.''; Latin plural ''consules'') was the title of one of the two chief magistrates of the Roman Republic, and subsequently also an important title under the Roman Empire. The title was used in other European city-states throug ...

for the year 381 with Flavius Eucharius as his colleague.

References

4th-century Romans 4th-century Roman consuls Imperial Roman consuls {{AncientRome-politician-stub