Britannia is an annual peer-reviewed academic journal published by Cambridge University Press on behalf of the Society for the Promotion of Roman Studies. It was established in 1970 and the first editor-in-chief was Sheppard Frere. The journal covers research on the province of Roman Britain, Iron Age and post-Roman Britain, and western provincial archaeology, as well as excavation reports. It was established because of the large increase in archaeological excavations, increased publication costs, and in order to establish coherence to the field of Roman Britain.