The Roman Map of Britain Columno? Stoke Hill,  Cullompton, or Killerton  Devon

Melamoni (R&C 15) next

Melamon, given the circumstances, must represent a site on the river Culm. The initial M came about just as in Manulodulo for Camuloduno, a text divider ( / ), or two (//) merged with the initial letter as /C (or //C) resulting in a reading of M. The final i may be the missing initial I of the next entry Scadu namorum for Isca Dumnoniorum.

The Roman fortlet at Stoke Hill (sx9295)) is above the junction of the Culm with the Exe, the forts at Killerton (SS9700) and Cullompton (st0107) are upriver. The forts were built during the first century, as was the fortress nearby at Exeter. According to Ekwall, Culm (on) Culm 938 derives from OW culm W cwlwm Co colm and colmen 'a knot'.  Breeze offers a borrowing of Latin columba 'dove', Welsh colom(en),  Old Cornish colom, Breton koulm, klom, Irish colum. 

A potential source, or influence, is Latin culmen and columen 'that which is raised on high, a height, summit, ridge' which would be a suitable name for the Stoke Hill fort (oblique-ablative Columine). Columna 'a column, pillar, post' might not be out of place, as the fort overlooks a hundred foot drop to the banks of the Culm. 

Margary makes no mention of roads connecting either of these forts to the next entry Isca Dumnoniorum Exeter (sx9192), or the previous entry Verteuia North Tawton (sx6699). Nevertheless, considering their proximity, it seems very likely there was a path between the forts at Exeter and Stoke Hill.

EHNMR-637077 STOKE HILL; EXETER Roman signal station SX9295
EHNMR-1048409 ST ANDREW'S HILL; CULLOMPTON Two-phase Roman fort ST0107
NTSMR-NA22380 Killerton; Broadclyst; East Devon Triple-ditched enclosure SS979002