Orford Castle was built for Henry II between about 1165 and 1173 near the Suffolk coast. The king created it during a period of tension with powerful regional lords, especially the Bigod earls of Norfolk. A new royal fortress at Orford strengthened administrative and military authority beside a developing port. The castle included a curtain wall, towers, ditches, and domestic buildings, but its most remarkable feature was the polygonal stone keep, whose complex plan combined a central core with projecting turrets and passages.

The keep contained a hall, private chamber, chapel, kitchen, well, latrines, storage, and spaces for officials and guards. Its carefully planned rooms made it a residence as well as a defensive tower. Royal sheriffs and constables managed the castle, collecting revenue and maintaining soldiers, equipment, and provisions. The nearby town received commercial privileges, while access to the North Sea connected Orford to fishing, trade, and coastal defense. Architecture and urban policy together asserted the Crown's presence in a district where baronial influence had been strong.

During the rebellion of Henry II's sons in 1173–74, the castle helped contain opposition associated with Hugh Bigod. Orford remained a royal property under later kings, though its importance varied with national politics and the condition of the port. King John maintained it during conflict with the barons, and the Crown continued to appoint keepers. As coastal geography changed and the harbor declined, the economic foundations of the settlement weakened. The fortress became less central to royal government, and its outer defenses and residential ranges deteriorated.

Ownership passed through noble and private hands after the Middle Ages. Most of the curtain wall and bailey buildings were quarried or collapsed, but the keep survived. Its height made it a conspicuous landmark for sailors, while continued uses for storage and local administration helped prevent complete destruction. Antiquarians studied its unusual plan, sometimes proposing exotic explanations for features that are now understood within twelfth-century royal architecture. The contrast between the standing keep and vanished enclosure can misleadingly suggest that it was always an isolated tower.

Orford Castle entered state care in the twentieth century. Conservation protects the keep's stone vaults, passages, chapel, well, and roof while archaeology reconstructs the missing bailey. The building offers unusually direct evidence of how Henry II's government joined defense, residence, symbolism, and bureaucratic control. Its history also depends on environmental change: the fortunes of the castle and town rose with a medieval port and declined as the coast shifted. Orford therefore records both royal strategy and the long interaction between fortification, commerce, and a changing maritime landscape.