Archaeological finds in the centre of Gloucester will tell the story of the health of the city's population over a 1,000-year period.

Cotswold Archaeology has announced previously unknown details about a medieval church in Gloucester, after completing its excavation programme as part of University of Gloucestershire's City Campus project.

The university commissioned Cotswold Archaeology to carry out an extensive excavation at the former Debenhams store, which is currently being transformed into a modern centre for teaching, learning and community partnerships, opening this year.

The City Campus courtyard, formerly a service/ goods yard for Bon Marche and then Debenhams, was previously occupied by St Aldate's Church, which was originally founded in the medieval period.

The size and form of the medieval church, and its associated burial ground, were unknown before the works at City Campus, as no previous archaeological investigations had been carried out in this part of the site.

Steve Sheldon, acting principal manager at Cotswold Archaeology, said: "The medieval church was demolished in the mid-1650s, with documentary sources indicating that much of its stonework was utilised to repair other parish churches in the town, such as those sustaining damage during the English Civil War.

"A new parish church, on or near the site of the medieval precursor, was constructed in the mid-18th century. The latter survived until the early 1960s, when it was demolished to make way for the department store."

Archaeological excavations within the courtyard fully revealed the footprint of the post-medieval church, represented by limestone and brick foundations, along with around 83 brick-lined burial vaults, both within the church itself and the burial ground.

These vaults had been cleared in the mid-1950s, before construction of the goods service area for Bon Marche.

Around 150 post-medieval burials, not contained in burial vaults, were identified in the courtyard. Deeper excavations revealed approximately 170 earlier burials, most of which are thought to relate to the medieval church.

In total, 317 skeletons and 83 brick burial vaults were recorded. Where impacted by the current development, burials have been recorded and carefully excavated by the archaeological team under the terms of a burial licence issued by the Ministry of Justice and a Faculty granted by the Diocese of Gloucester.

Steve Sheldon continued: "Although the footprint of the medieval church was not identified during the current archaeological works, the identification of a limestone wall with surviving lime plaster most probably represents part of the earlier church.

"If so, it is now evident that the floor plans of the two churches were not coincident, with the medieval church being constructed much further to the south, away from the St Aldate Street frontage.

"In addition to the limestone wall, a number of worked stone objects were recovered, including part of a mid-14th-century window arch with some internal tracery, associated with the medieval church.

"These objects have been retained on site, following archaeological recording, and will be displayed for students, staff and visitors to City Campus to appreciate."

Archaeological works were carried out in the basement (lower ground floor) of the property and during external works throughout the existing service courtyard, including work associated with connecting utilities to the site from St Aldate Street.

A series of sump pits excavated in the existing basement revealed evidence of Roman activity, including the remains of walls where the stones had been systematically removed, probably for use elsewhere, timber stakes and planking, a metaled courtyard surface and a small number of pits and ditches. Many of these features and deposits are comparable with those identified during archaeological works undertaken in the 1950s and early 1960s, before the construction of the building.

Cliff Bateman, senior project Officer at Cotswold Archaeology, said: "While our archaeological works are now complete on site, we will be undertaking scientific analysis of the finds and the human remains to learn more about the lives of those buried within the church yard.

"As this was an urban church, the story it will tell about the health of Gloucester's population over a period of around 1,000 years will be most interesting. For example, on a very basic level, the impact of increased sugar in the diet during the 16th century was visibly clear in terms of dental health. The full results of these studies will be published in due course."