The Domesday hundred of Merset (Mersete), whose administrative centre was Maesbury, is the direct territorial unit within which Old Oswestry hillfort and its surrounding land lay; the castle recorded in 1086 as "L'Oeuvre" was planted on a glacial mound immediately north of the old hilltop site, in a landscape that had previously been the frontier estate of a Saxon landholder named Oswald. Old Oswestry hillfort itself had no separate Domesday entry - the entire area was subsumed within the Meresberie (Maesbury) manor held by Renaud de Bailleul under Earl Roger of Montgomery, and Oswestry [Castle] appears in the survey only obliquely, referenced at Phillimore Shropshire 4,1,11. The passage thus reveals that by 1086 the old Iron Age and early-medieval hilltop had been superseded as a political centre by the new Norman castle in the valley below, yet the Saxon place-name tradition rooted in this landscape survived and eventually gave the town its name.

This passage reveals that Old Oswestry was recognized in local tradition as a prehistoric British fortified settlement located approximately three-quarters of a mile from the modern town. The account documents a folk-belief that the construction of Oswestry town itself was hindered by supernatural forces until the builders relocated from a hill site (Berth Hill) to a more successful location, reflecting the historical significance of Old Oswestry as an Iron Age hill fort that predated the medieval and modern settlement.

Cathrall's *History of Oswestry* traces the course of Wat's Dyke through the Oswestry parish landscape, explicitly placing "Old Oswestry" on the route of this early medieval linear earthwork between the town of Oswestry and the neighbouring township of Pentreclawdd, and onward to Gobowen in the parish of Whittington. This situates Old Oswestry firmly within the manorial and parochial territory of Oswestry, confirming its role as a named locality of historical significance within that estate's bounds. The passage also documents surrounding named fields, pillars of stone, and adjacent manorial townships (Maesbury, Gobowen, Henlle), providing important context for the medieval landscape of the Old Oswestry area.

This Historic England record demonstrates that Old Oswestry has a long prehistoric and early historic occupation sequence, with Neolithic, Bronze Age, and Iron Age phases documented through finds and excavation. The site's Bronze Age and Iron Age evidence shows continuous settlement through the Iron Age period, before the hillfort was later incorporated into Wat's Dyke in the Early Medieval period. No evidence of Roman occupation or attack is specifically mentioned in this passage.

This is a grey-literature publication assessing the archaeological excavations conducted at Old Oswestry Hillfort by W. J. Varley in 1939-40. The work presents site narrative and archive assessment materials, providing structured documentation of one of Shropshire's most significant Iron Age monuments and the results of its only major twentieth-century excavation programme.