St Catherine's Chapel:  A wooden floor was removed in the 1971 restoration revealing medieval tiles and a curious carved stone, possibly from a tombstone.  In this chapel is the organ of 1894, the remaining fragments of medieval glass, the 16C tomb of Elizabeth Frowick, later Coningsby, and the crimson Dossal dates as Italian 16C by the Victoria and Albert Museum and presented to the church by Mrs Walter Burns.

The church guide suggests that Elizabeth Frowick's grandfather was Robert Knolles who in turn was the grandson of Thomas Knolles who it is thought built North Mymms Manor.

St Mary's Church, North Mymms with West Tower at far end		Floor plan of church showing St Catherine's Chapel top right		Elizabeth Frowick's (later Coningby) tomb top and only visible side
Elizabeth Frowick's tomb wedged in by the Church organ of 1894		St Catherine's Chapel a store room for chairs hidden by a curtain from the rest of the Church		Close up of the side of the tomb of Elizabeth Frowick
One of two windows in St Catherine's Chapel just above the tomb with several references to Coningsby		The framed description of St Catherine's Chapel including references to Elizabeth Frowick and the Coningsby family		The West Tower thought to have been built by Thomas Knolles in 1428
Detail of the stain glass windows		Detail of the stain glass windows		Detail of the stain glass windows