Which preposition to use with thetford

by Occurrences 1%

A non-juror, consecrated in 1693 suffragan bishop of Thetford by three of the deprived non-juror bishops.

in Occurrences 1%

CHAPTER XLIV KISMET Between Brandon in Suffolk and Thetford in Norfolk runs a quiet river, the Little Ouse, where few boats break the stillness of the water.

Which preposition to use with  thetford