St Mary de Lode Church is a Church of England church immediately outside the grounds of Gloucester Cathedral. It is believed by some to be on the site of the first Christian church in Britain. The church is in the Diocese of Gloucester and Grade I listed by English Heritage. It has also been known as St. Mary Before the Gate of St. Peter, St. Mary Broad Gate and St. Mary De Port.

Gloucester Cathedral, formally the Cathedral Church of St Peter and the Holy and Indivisible Trinity and formerly St Peter's Abbey, in Gloucester, England, stands in the north of the city near the River Severn. It originated with the establishment of a minster, Gloucester Abbey, dedicated to Saint Peter and founded by Osric, King of the Hwicce, in around 679. The subsequent history of the church is complex; Osric's foundation came under the control of the Benedictine Order at the beginning of the 11th century and in around 1058, Ealdred, Bishop of Worcester, established a new abbey "a little further from the place where it had stood". The abbey appears not to have been an initial success, by 1072, the number of attendant monks had reduced to two. The present building was begun by Abbott Serlo in about 1089, following a major fire the previous year.