Warwick Wroth 
Catalogue of the Coins of the Vandals, Ostrogoths and Lombards [PDF ebook] 
And of the Empires of Thessalonica, Nicaea and Trebizond, in the British Museum

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Quasi-autonomous bronze coins of Rome and Ravenna Imperial coins of Justinian I struck at Rome and Ravenna Imperial coins of Justin II struck at Ravenna.