(2009),[19] who comment that "a single, massive stone tower does not seem to belong within the outer defences of an earth-and-timber castle", and other sources have concurred on architectural grounds, also noting that its orientation does not match that of the remainder of the castle, and that its height would have originally afforded an extensive view over the city, but which would have been superseded (and in fact, blocked) with the construction of the castle motte.[20][21][22] The date of the remaining towers is uncertain although the southernmost, round tower, of which the base still remains, is dated to 1235 in various documentary sources, including Woolnoth's The Ancient Castles of England and Wales of 1825; in at least one source, it is referred to as "Henry III's Tower".[23]