Mostly 14th century, although the north and south aisles were rebuilt c1500. The tower is 10 feet square and is supported externally by diagonal buttresses. The lower part was built in 1340 and the upper finished later in the same century. Originally it was topped by a shingled spire which was used as a landmark that helped to guide vessels up the River Colne. Inside, a large stone has been built into the wall of the tower arch. This may have been acknowledgement of the site as a former pagan site - the evidence of megalithic circle stones is also at nearby Alphamstone church