Excavation of St Bertelin's Chapel in Stafford

In 1954, archaeologists led by Adrian Oswald excavated the site of Saint Bertelin’s Chapel at the western end of Saint Mary's Collegiate Church in Stafford, Staffordshire. Carried out ahead of churchyard landscaping works, the excavation uncovered centuries of continuous religious use, transitioning from an 18th-century schoolhouse and medieval stone chapel down to an Anglo-Saxon timber structure containing a rare buried wooden cross.

The excavation was initiated because the Borough of Stafford intended to clear and level the overgrown churchyard at Saint Mary's to create public gardens. Historical records indicated that the medieval chapel dedicated to Saint Bertelin—demolished in 1801 after serving as both a council chamber and King Edward VI Grammar School—stood directly west of Saint Mary's tower. Recognizing the archaeological potential of the ground, the borough authorized a formal investigation directed by Adrian Oswald, then Keeper of Archaeology at Birmingham City Museum.

Excavators opened deep trenches across the western approach to the church tower. They initially cleared post-medieval rubble and topsoil, exposing the rectangular ground plan of the late medieval stone building. The masonry remains consisted of substantial sandstone foundations dating primarily to the 13th and 14th centuries, which confirmed the layout of Saint Bertelin's Chapel as it existed prior to its 1801 demolition.

Beneath the medieval stone levels, the excavators found evidence of earlier structural phases. Careful scraping of the underlying clay revealed a series of postholes, beam slots, and burnt daub. These features formed the outline of a pre-Conquest, timber-framed building dating to the late 10th or early 11th century. Surrounding this early structure were numerous early medieval burials, establishing that the site had been a venerated burial ground and sacred site long before the stone chapel was constructed.

The most notable discovery occurred beneath the floor levels of the timber building, where the team discovered a centrally placed, deep pit containing the charred remains of a large wooden post or cross. The cross had been deliberately buried before the construction of the timber church. Archaeologists interpreted this as an early Mercian preaching cross or grave marker associated with the veneration of Saint Bertelin, an 8th-century hermit saint deeply rooted in local tradition.

Following the conclusion of the 1954 excavation, the site was backfilled to preserve the sub-surface remains. To commemorate the discoveries, the borough permanently delineated the footprint of both the medieval stone chapel and the Anglo-Saxon timber building using patterned paving stones set into the grass of the churchyard, where they can still be seen today.