The post was possibly created during the reign of Constantine I, and was probably in existence by AD 367 when Nectaridus is elliptically referred to as such a leader by Ammianus Marcellinus.
The Count's remit covered the southern and eastern coasts of Roman Britain during a period of increasing maritime raids from barbarian tribes outside the empire.
In 367, a series of invasions from Picts, Franks, Saxons, Scots and Attacotti appears to have defeated the army of Britain and resulted in the death of Nectaridus.
[2] Eutropius had already spoken of the channel being cleared by Carausius, since the Armorican and Belgian coasts had been 'infested' with Francs and Saxons.
[3] The 5th-century Notitia Dignitatum lists the names of the Saxon Shore forts,[4] from Norfolk to Hampshire that were under the Count's command.