When Edward built his new castle, he also established a new town north of his fortress.
Its original grid pattern of streets – the present High Street, crossed by Castle and Church Streets and Parliament and Gwindy Streets – still forms the heart of modern Rhuddlan, and part of its ditched defenses are still visible between Vicarage Lane and Kerfoot Avenue.
At the corner of High Street and Parliament Street stands the (so-called) Parliament House – not as its inscription claims the site of a parliament, but perhaps the medieval town’s courthouse.