Tintagel's divided headland rises above Cornwall's north coast in a landscape occupied long before the visible castle. Archaeology reveals a substantial settlement from roughly the fifth through seventh centuries, when high-status residents used stone and timber buildings and imported wine, oil, and fine tableware from the Mediterranean. The site's precise political identity remains debated, but it was connected to powerful rulers in post-Roman Dumnonia rather than an isolated refuge. Erosion and later building have removed parts of this early medieval complex, while buried remains continue to shape interpretation.

Geoffrey of Monmouth's twelfth-century account associated Tintagel with the conception of King Arthur, giving the promontory a literary fame not supported by proof of a historical Arthur's presence. Richard, Earl of Cornwall and brother of Henry III, acquired the site and built the surviving castle in the 1230s. Its mainland and island wards, great hall, chapel, service spaces, walls, and narrow approach emphasized dramatic setting and legendary prestige. The castle had limited strategic value and was costly to maintain, functioning more as a symbolic residence and occasional administrative site.

Buildings deteriorated after Richard's death, though officials, prisoners, and local users occupied portions at different times. By the late Middle Ages much of the castle was ruinous. Antiquarian interest, Romantic literature, and expanding tourism revived Tintagel's Arthurian associations during the eighteenth and nineteenth centuries. Excavations in the 1930s exposed both Richard's masonry and the earlier settlement, though early methods sometimes blurred interpretation. Later archaeological work identified imported pottery, glass, inscribed stone, buildings, and occupation surfaces that established the headland's importance centuries before the thirteenth-century castle.

English Heritage stabilizes the surviving walls and archaeological deposits rather than reconstructing the castle to full height. The old crossing between headland and island had vanished, leaving a strenuous descent and climb. A new pedestrian bridge opened in 2019 across the gap, positioned high above the earlier route and designed as an unmistakably modern structure. Paths, steps, railings, drainage, signs, and artworks also support access. The exposed masonry is chiefly authentic medieval ruin with repairs; the bridge and interpretive installations are contemporary additions, not restored parts of Richard's castle.

Tintagel is a ticketed site where timed entry, weather, wind, maintenance, and rugged terrain can affect access. Visitors encounter archaeology and legend together but should not confuse one with proof of the other. The castle's value lies in the contrast among an elite post-Roman settlement, a Plantagenet lord's deliberate use of Arthurian prestige, centuries of decay, modern excavation, and continuing cultural imagination. Coastal erosion makes preservation urgent, while restrained stabilization keeps loss visible. The modern bridge restores a practical connection without pretending to reproduce the uncertain medieval crossing it replaces.