The remains of the motte,beside the River Lea. see http://www.castlefacts.info/castledetails/castleDetails3.aspx?uin=11540 see http://en.wikipedia.org/wiki/Hertford_Castle see http://www.ecastles.co.uk/hertford.html see http://www.google.co.uk/search?q=hertford+castle&hl=en&rls=com.microsoft:en-gb:IE-SearchBox&prmd=m&tbs=tl:1&tbo=u&ei=_n2XTOHTBcqb4Aa2q9zwBA&sa=X&oi=timeline_result&ct=title&resnum=12&ved=0CEUQ5wIwCw