Comes Britanniarum

The Comes Britanniarum (Latin for "Count of the Britains") was a military post in Roman Britain with command over the mobile field army from the mid-4th century onwards. It is listed in the List of Offices as being one of the three commands in Britain, along with the Dux Britanniarum and the Comes litoris Saxonici. His troops were the main field army (comitatenses) in Britain and not the frontier guards (limitanei) commanded by the other two.