The saint appears in the centre light of the south window; he is portrayed holding a pastoral staff in his left hand and a book in his right.

The dedication may arise from John Fitzherbert having been Governor of Waterford for 3 years c. 1174[5] Born in the second half of the 6th century, Finnbar was baptised Lochan, but was later called Fionn Barr or the Fair-Headed One.

The roof of the chancel is a later 15th-century wooden construction; external buttresses and internal shafts running up to the roofline indicate that the original design may have intended a fan vault, never built.

He is shown in full plate armour with a collar of alternating suns and roses with a pendant of the White Lion of the House of Marche, the badge of Edward IV.

Ralph bears the Yorkist livery collar of alternating suns and roses, with the White Boar of Richard III as a pendant.

Since the destruction by fire of the wooden effigy of Ralph Neville (d. 1484) at Brancepeth, this is the only surviving representation of a boar pendant.

The armour portrayed on the effigy of Ralph Fitzherbert has been reproduced as a fully functional suit of plate.

[11] An incised effigy on an alabaster slab of a woman tied in a shroud has been identified as that of Benedicta (d. 1531), wife of John Fitzherbert, 13th Lord.

In his will he disinherited Benedicta and denied paternity of her children, stating "…Bennett my wyffe hath been of lewd and vile disposicion and cowde not be content with me but forsaken my houshoolde and company and lyffed in other places where yt pleased her.

"[5]: 86–89 The great east window of the chapel originally held 14th-century glass depicting a large scene with full-sized figures.

Thomas Bingham,[12] was approached by a Roman Catholic family of Yorkshire with a view to purchasing the glass.