Bedford Castle was probably built after 1100 by Henry I in the town of Bedford, overlooking the River Great Ouse. The castle was constructed inside the town itself, and many of the older Anglo-Saxon streets had to be destroyed and diverted to make room for it, leaving a permanent mark in the formal grid system. The castle was built in a motte and bailey design and was probably much smaller than the later castle, just consisting of the motte and the inner bailey.