Dictionary of Greek and Roman Geography/Constantia 2.

CONSTA′NTIA (Coutances), a place in the NW. of Gallia, which Ammianus (xv. 11) calls Castra Constantia. In the Notitia the Civitas Constantia is mentioned as being in Lugdunensis Secunda. A local tradition assigns the foundation of this place to Constantius Chlorus, the father of Constantine. Ammianus says that the Sequana (Seine) enters the sea near Constantia; but his geography of Gallia is very inexact. The name of the Pagus Constantinus is the origin of the name Côtantin, which in the ante-revolutionary geography of France designated the peninsula in which Coutances is situated. [ G. L. ]