Beyond this there was a double Vallum or wall of earth so steep as to be climbed with great difficulty.
"Beric the Briton A Story of the Roman Invasion"
G. A. Henty
Earthworks and camps still guard the British ancient roads and trackways, and you still admire their triple Vallum and their cleverly protected entrance.
"Vanishing England"
P. H. Ditchfield
This means caput valli, and is the name for the eastern termination of the Vallum of Antoninus.
"The English Language"
Robert Gordon Latham