Excavations at Oxford Castle: Oxford’S Western Quarter from the Mid-Saxon Period to the Late Eighteenth Century (Based on Daniel Poore’S Tom Hassall Lecture for 2008)
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Excavations at Oxford Castle: Oxford’s Western Quarter from the Mid-Saxon Period to the Late Eighteenth Century (Based on Daniel Poore’s Tom Hassall Lecture for 2008) Daniel Poore, Andrew Norton, and Anne Dodd SUMMARY Excavations and building recording work carried out at Oxford Castle have revealed important new information about Oxford’s late Anglo-Saxon origins, demonstrating that the defensive rampart extended around the western quarter of the town. New results suggest that the enigmatic St George’s Tower may pre-date the Norman Conquest, and the town’s grid of late Anglo-Saxon metalled streets may have extended as far as its west gate, with commercial and domestic buildings laid out along its line. The massive ditches and earthworks associated with the construction of the Norman castle have been revealed, along with evidence for the walls, gates, bridges, towers, and internal structures of the Anglo-Norman and later medieval castle. A group of burials from the motte ditch, dating from the late fifteenth to the eighteenth centuries, are probably those of prisoners; some of the remains showed evidence of dissection for anatomical study. Evidence has also been recovered for minor adaptations of the castle during the Civil War, and for the way in which it gradually faded from the urban landscape as tenements encroached on its ditches, and its interior was turned over for use as pleasure gardens, once it had become obsolete. etween 1999 and 2005 Oxford Archaeology carried out a programme of archaeological Bevaluation, excavation, and watching-brief work at the site of Oxford Castle, which included the area of buildings used as Oxford Prison until its closure in 1997. The work was in advance of the redevelopment of the site by Oxford Castle Ltd and the Oxford Preservation Trust. A monograph on the results of excavations at the site between 1999 and 2005 is due to be published in 2010, and work on analysing and interpreting the results is still ongoing. This paper is therefore an interim report on those results. Oxford Castle is situated at the western end of medieval Oxford, on the southern spur of the Summertown-Radley gravel terrace, to the east of the river Thames and to the west of the river Cherwell. The confluence of these two rivers is about 2 km south-east of the castle (Fig. 1). Detailed analysis has been carried out only for particular phases and areas of the site, and the level of discussion below reflects this. The results are presented in five project phases, and concentrate on those phases that seem to shed most light on the development of the town and the early castle itself, as well as an intriguing group of post-medieval burials from within the motte ditch. PRE-BURH ACTIVITY TO c.911 The development of Oxford is thought to have begun in the mid-Anglo-Saxon period. There is increasing evidence for the existence of a mid-Anglo-Saxon minster here, on the site that is today occupied by Christ Church and Oxford Cathedral, and this would have acted as a focus for settlement, trade, and development.1 However, evidence for mid-Anglo-Saxon activity in Oxford 1 Anne Dodd, ed., Oxford before the University, the late Saxon and Norman Archaeology of the Thames Crossing, the Defences and the Town, Thames Valley Landscapes Monograph, 17 (Oxford, 2003), pp. 17–19. Published in Oxoniensia 2009, (c) Oxfordshire Architectural and Historical Society 2 DANIEL POORE, ANDREW NORTON, AND ANNE DODD Fig. 1. Site location Published in Oxoniensia 2009, (c) Oxfordshire Architectural and Historical Society OX FORD CASTLE EXCAVATIONS 3 remains relatively scarce; most notably there is the river crossing at St Aldate’s, seventh-century and later burials at Christ Church, and a ditch below the earliest burh street surface at Church Street, now partly covered by Penny Farthing Place.2 Evidence for this early period was also limited at the castle site, but what was seen was indicative of a pastoral landscape. Dung-rich turves within the late Anglo-Saxon rampart (see below) are likely to have been dug from pastureland in the vicinity at the time the rampart was first constructed. A total of twenty-three sherds of redeposited early to middle Anglo-Saxon handmade pottery was recovered from deposits across the site, with pit digging and evidence of possible buildings also found. The best evidence for an early building seen at the castle site was a partially preserved postbuilt structure (see Fig. 3, Structure C1. The position of the postholes has been shown on the figure, but they were, in fact, overlain by a metalled surface). Although direct dating evidence for this building is very limited, it was built and subsequently demolished prior to the construction of the metalled surface that overlay it, which we have interpreted as part of a late Anglo-Saxon street (see below). A network of surfaced streets seems to have been part of the original layout of the town and was probably in place by about 920.3 This would imply that Structure C1 pre-dates the establishment of the street grid and therefore dates from the early tenth century or before. Potentially it is one of the earliest known Oxford buildings. Further support for this comes from the presence in the pottery assemblage from the site of sherds of Stamford ware datable to the period from the mid-ninth to the early tenth century. EVIDENCE FOR THE LATE ANGLO-SAXON TOWN, c.911–1071 (Fig. 2) Defences It is assumed that Oxford’s defences were constructed at the turn of the tenth century. The town must have had fortifications by the period 914–19, when it appears in a list of West Saxon and Mercian defensive centres (or burhs) known as the Burghal Hidage, and there is no strong evidence for fortifications prior to that time.4 A large earthen bank or rampart, up to 15 m wide, was observed in at least three locations along the southern part of the castle site (Fig. 2). It was of very similar size and form to the town rampart identified during earlier excavations at St Michael’s St, the Church of St Michael at the Northgate, and at New College.5 The bank was constructed directly upon natural gravel, the circuit presumably having been de-turfed to define the line and provide turves for construction. It was constructed from redeposited gravel, loess, topsoil, and turves. The primary deposits consisted of turf lines between dumps of soil. Micromorphological analysis demonstrated that the turves were rich in dung. A ragstone retaining wall had been constructed against the southern face of the bank in at least two phases and was again very similar in appearance to that seen at the Northgate. The wall was faced only on its southern, outer side and had a rubble core. It is worth noting here that the presence of medieval Oxford ware pottery (Oxfordshire Fabric OXY) within the construction cut of the wall, a feature that can be demonstrated to be stratigraphically earlier than the eleventh-century castle, must lead to a re-evaluation of the earliest date of manufacture for the pottery, previously thought to be c.1075. 2 Angela Boyle, ‘Excavations at Christ Church Cathedral graveyard, Oxford’, Oxoniensia, 66 (2001), pp. 337–68; T. G. Hassall, C. E. Halpin, and Maureen Mellor, ‘Excavations in St Ebbe’s, Oxford, 1967–76: Part I: Late Saxon and medieval domestic occupation and tenements, and the medieval Greyfriars’, Oxoniensia, 54 (1989), pp. 81–110. 3 Dodd, Oxford before the University, pp. 26–9. 4 Ibid., pp. 19–22; 31–2. 5 D. R. P. Wilkinson, ‘Excavations at 24A St Michael’s St, 1985’, in Dodd, Oxford before the University, pp. 140–52; B. Durham, C. Halpin, and N. Palmer, ‘Oxford’s northern defences: archaeological studies, 1971–82’, Oxoniensia, 48 (1983), pp. 13–40; Paul Booth, ‘Excavations on the line of the city defences at New College, Oxford, 1993’, Oxoniensia, 60 (1995), pp. 205–24. Published in Oxoniensia 2009, (c) Oxfordshire Architectural and Historical Society 4 DANIEL POORE, ANDREW NORTON, AND ANNE DODD Fig. 2. Plan of mid- and late Saxon archaeological features and the presumed layout of the town’s western street plan Published in Oxoniensia 2009, (c) Oxfordshire Architectural and Historical Society OX FORD CASTLE EXCAVATIONS 5 The rampart at Oxford is generally similar in construction to those seen at Wallingford, Hereford, Cricklade, Wiltshire, and Lydford, Devonshire, where the defences were seen to be, or assumed to be, constructed from turves.6 At Hereford, Cricklade, and Lydford the ramparts were also faced by stone walls, whereas at Wallingford and at Wareham, Dorset, walls were seen on the crest of the rampart.7 It has been suggested that the rampart at New College may have formed part of an eleventh- century eastern extension of the burh, possibly as a result of renewed Danish attacks.8 However, the existence of a later extension to a primary fortified burh has proved difficult to reconcile with other excavated evidence, in particular the consistency in the construction and appearance of the rampart, and the earliest Anglo-Saxon street surfaces, throughout Oxford.9 The presence at the castle site of a stone retaining wall similar to that seen at St Michael at the Northgate, and a street surface almost identical in nature to the earliest surface seen at Church Street and elsewhere, lends weight to the theory of a town built in one phase, rather than with extensions to east and west. On the southern side of St George’s Tower two burials were cut into the rampart and were carbon dated to c.1000 AD (see below).