Gainas (Greek: Γαϊνάς) was a Gothic leader who served the Eastern Roman Empire as magister militum during the reigns of Theodosius I and Arcadius.
Gainas began his military career as a common foot-soldier, but later commanded the barbarian contingent of Theodosius' army against the usurper Eugenius in 394.
After suffering repeated failures against the Ostrogoths, who continued devastating the provinces of Asia Minor, Gainas advised Arcadius to accept Tribigild's terms, which included the death of Eutropius.
He attempted in effect to copy the success of Stilicho in the West and posed a danger to the survival of the Eastern Roman Empire.
[6] In response, Gainas and his forces attempted to flee back across the Hellespont, but their rag-tag ad hoc fleet was met and destroyed by another Goth in Imperial service, Fravitta, who was subsequently made consul for 401 but was later accused of treason and executed as well.