It was the capital city of the Western Roman Empire from 402 until that empire collapsed in 476. It then served as the capital of the Kingdom of the Ostrogoths until it was re-conquered in 540 by the Eastern Roman (Byzantine) Empire. Afterwards, the city formed the centre of the Byzantine Exarchate of Ravenna until the invasion of the Franks in 751, after which it became the seat of the Kingdom of the Lombards.

Constans II Hover to enlarge Constans II

Constans II
644 to 645 AD
Mint: Ravenna
AE Follis
Obvs: DN CONSTANTINVS PP. Bust facing, wearing crown and chalamys, and holding globus cruciger.
Revs: M between ANNO and numerals II II. Cross above, RAV in exergue.
20x26mm, 3.7g
Order # B 095
Ref: Sear 1138, Gr.--, D.O. 206