Bernhard Woytek and Dario Calamino have proposed the following three main categories:
- issues combining the Latin name of the emperor and imperial titles on the obverse with a Greek legend on the reverse
- "pseudo-bilingual" issues, with imperial names and titles in Greek and a conventional mark of authority in Latin
- issues regarded as bilingual "by mistake".
The aim of our paper is to describe other possible types noted between the first century BC and the third century AD, i.e.:
- bilingual issues with the same text in Latin and in Greek
- bilingual issues featuring the name and title of one personage (king or emperor) in Latin and a name and a title of another personage (queen or empress) in Greek
- bilingual coins with the imperial name and titles on the obverse in Greek in a combination with Latin legends on the reverse.