Architectural Features
It has very fine windows and is said to have been built by Edmund Gonville, founder of Gonville Hall, later Gonville and Caius College, Cambridge, who was rector here circa 1340.
A 5-light east window with fragments of C14 glass and a 3-light west window, both with cusped intersecting tracery, and 2 2-light windows on the south wall, one with pointed-trefoiled lights and 3 circles with quatrefoils in the head, similar to the south windows at Rickinghall Inferior.
Interior much restored in 1872, when the pulpit and seating were replaced, and again in 1895, when the chancel was reroofed in Spanish chestnut.
Many older features remain: a simple octagonal font, standing on a large plain column with a low raised base
TM0178 : St Nicholas, Thelnetham - Font
the doorways and stair to the rood loft behind the pulpit
C14 arcade in 4 bays on south side: octagonal piers without capitals, quarter-round mouldings to arches.
The chancel and south aisle both have medieval stone altars with recut consecration crosses, which were reinstated during the 1895 restoration.
A large squint at the south-east end of the nave has a small brass with inscription to Anne Caley below it.
On the south wall of the aisle an alabaster and marble monument to Henry Buckenham and Dorothy his wife : 2 demi-figures in an arched niche with looped-up curtains, and a son and daughter below in oval niches.
On the north wall of nave, an C18 wooden panel with the Flight into Egypt carved in high relief, probably Italian.
The windows contain a particularly large amount of old crown and cylinder glass.
In the floor of the base of the tower are 3 small black tiles, set diamondwise, and variously inscribed WR1735, SR1744 and ER1721.