 It is tempting to regard this discovery as the remains of a ring castle, of the motte-and-bailey type, built around the year 1000 by Count Dirk III.Earlier studies located the battle a few kilometres away from the present town centre.Rotterdam's city archaeologist Hoek placed the battle three kilometres to the west, around the present municipal boundary with Maassluis, while De Graaf placed it two kilometres to the east, in the Babberspolder.