What is "carlbury"

Carlbury is a hamlet in the civil parish of High Coniscliffe in County Durham, in England. It is situated a few miles to the west of Darlington, on the north bank of the River Tees between Piercebridge to the west, and High Coniscliffe to the east. High and Low Carlbury once constituted a slightly larger settlement, but most of the hamlet at Low Carlbury became derelict and was demolished by the late 1940s. A few buildings remain.