The Roman Map of Britain Dubalis(is) Elginhaugh, Lothian or Castle Greg

Duabsisis var. Duabsissis (R&C 181) next

The name Dalhousie  Dalwussy 1235, Dalwlsy, Dalwulsy 1298 doesn't seem to have been recognized as kin to rivers of the Dub-glais 'dark-stream' family such as Dawlish, Douglas and Dulas. Dalhousie is on the South Esk The final -is of Dubalisis seems awkward and is likely the result of dittography, or the mistaken incorporation of a double-stop (//).

Elginhaugh (NT3267) fort on North Esk
Eskbank (NT3266) two marching camps between N and S Esks.
Dalkeith (NT3469) marching camp at junction of N and S Esks

To complement a proposed *Caromago at Livingston/Kirkton, we need a 'dark stream' in the vicinity. Just to the south is the Roman fortlet at Castle Greg (NT0559) above Black Burn.