Dorm-ceaster

According to the Old English Dictionary:

Dorm-ceaster

gen. -ceastre; f. [by the Britons called Cair-Dorm, by Antonīnus Durobrivæ, from the passage over the water; and the Anglo-Saxons, for the same reason, called it also Dornford] Dornford or Dorgford, in Huntingdonshire, on the river Nen, Som. Ben. Lye. dorm-ceaster