The Dux Belgicae secundae ("commander of the second Belgic province") was a senior officer in the army of the Late Roman Empire who was the commander of the limitanei (frontier troops) and of a naval squadron on the so-called Saxon Shore in Gaul. These two commanders were the successors to an official the Comes Maritimi Tractus (Commander of the Coastal Regions), who formerly commanded both the British and the Gallic part of the Saxon Shore. These two commanders maintained coastal defenses until the mid–5th Century. A well known commander was the Frankish king Childeric I (late 5th century).