There is some evidence that the site of the present church was at that time the river bed, and that the Saxon church was situated nearer North Street to the west.

[2][4] The south aisle was extended in the 15th century, by the Trenchard family of Wolfeton House, to form the south chapel, and further extended in the early 16th century.

There are table tombs of members of the Trenchard family in the south chapel.

The north and south vestries, adjacent to the tower, are also of this period.

Thomas Trenchard's spiral monogram is carved on the tower in many places, and on the vestries.