 The community of Walwyns Castle consists of the parishes of Walwyns Castle itself and the parishes of Hasguard and Robeston West.In 2011 the population of the community of Walwyn's Castle was 355 with 15.2 per cent able to speak Welsh.In his 12th century Gesta Regum Anglorum, William of Malmesbury claimed that the grave of Gawain (, ) was found here around the end of the 11th century and that the castle mound covers the site.