"the fleet at Ravenna"

Ravenna was the chief Roman naval base in northern Italy, on the upper Adriatic. Its fleet, the classis Ravennas, was the second most senior fleet of the imperial Roman Navy after the classis Misenensis.

 

Mosaic depicting the port of Classis on the basilica of Sant'Apollinare Nuovo in Ravenna (c. 526 A.D.)
Public DomainMosaic depicting the port of Classis on the basilica of Sant'Apollinare Nuovo in Ravenna (c. 526 A.D.) - Credit: Master of Sant'Apollinare