It was unusual for a new royal castle to be built in this part of England during the 12th century .
Henry appears to have been driven by the military threat from Scotland before and during the Great Revolt of 1173 to 1174 .
It was unusual for a new royal castle to be built in this part of England during the 12th century , and Henry appears to have been driven by the military threat from Scotland before and during the Great Revolt of 1173 to 1174 .