What is "coggabata"

Coggabata, or Congavata / Concavata, (with the modern name of Drumburgh) was a Roman fort on Hadrian's Wall, between Aballava ( Burgh by Sands) to the east and Mais (Bowness on Solway) to the west. It was built on a hill commanding views over the flatter land to the east and west and to the shore of the Solway Firth to the north. Its purpose was to guard the southern end of two important Solway fords, the Stonewath and the Sandwath.

The Notitia Dignitatum gives the name of the fort as 'Congavata', but the Rudge Cup gives the name as 'Coggabata'.