- Building Information
Gaillon-sur-Montcient
(Yvelines, France)
Notre-Dame-de-l'Assomption
Surveyed: 1972-74, 1980-83, 2003, 2014
- Locator Map
Gaillon-sur-Montcient (Yvelines, France) - Notre-Dame-de-l'Assomption
- Disclaimer
The dating found here is based on the work of John James, and is meant on this site to serve as a starting point. James' dating is derived from a system that uses his interpretation of the development of capitals over time as the basis for chronology, among other factors. His goal is to refine the dating to within years rather than decades. I have not fully embraced James' methodology, and will be developing this page from its current state to one which is admittedly more conservative. The relative expenditure values found in the Timeline are also based on James' work, and I believe these to be reasonably reliable. They are intended only to give a sense of the amount of work involved in each decade.

I have added the idea of the "project" as a way of separating work in buildings. In my mind, a "project" is a discrete section of work in a building that resulted from the one-time acquisition of funding. "Projects" are generally separated by at least a decade where no work was being done. It is my view that it would have been unwise to start a "project" that could not be finished and protected from the elements, and as such a "project" usually involved a wing or multiple wings of a building, from floor to roof. Rural churches, which could only secure small amounts of funding at irregular intervals, often were the result of many small projects, while the great churches, which benefitted from relatively consistent funding, may have involved only a few large projects.
- Timeline with Relative Expenditure (if available, in building units)






- Project A - Earlier - Phase 1 -
Presumably there had been an earlier square bay and apse to the east, the buttresses on the east side of the crossing suggest a narrow bay; probably had transepts against which the later transepts were added.
- Project B - 1110s - Phase 2 - nave, crossing
Set out nave and crossing together with bases at the same height from setback in north side of WN buttress; bases of W-s door.
- Project B - 1110s - Phase 3 - crossing (c)
Crossing capitals with arches and buttresses to support the tower
- Project B - 1110s - Phase 4 - nave (a)
Nave capitals and imposts set against crossing
- Project B - 1110s - Phase 5 - tower I
Tower I, and buttresses changes 3 courses above arches into roof.
- Project B - 1120s - Phase 6 - tower II
Tower II from above previous change to openings in next level visible above choir vaults, round arches.
- Project C - 1140s - Phase 7 - north
North transept with triple shafts on three corners.
- Project D - 1160s - Phase 8 - W-s
South nave doorway shafts and caps added with a projecting gable roof.
- Project D - 1160s - Phase 9 - spire
Spire financed by Count Galeran
- Project E - 1180s - Phase 10 - south
South transept with en delit shafts against crossing; because the lower courses of stonework around the choir are very different to the upper, the external walls of the choir with buttresses were built at this time.
- Project F - 1210s - Phase 11 - choir (a)
Upper aisle walls of choir; the entire building erected independently of earlier with wider spans; choir piers and arcade arches, and aisle vaults and intended to demolish older west as new arcade arch started in EN1+aisles .
- Project F - 1210s - Phase 12 - choir (c)
Choir clerestory windows wider then below and the wall is set back over the horizontal moulding over the aisle windows; this clerestory level of the eastern wall was built on its own, with its clerestory vaulting caps, as can be seen in joints of each sid
- Project G - Later - Phase 13 -
Choir clerestory windows wider then below and the wall is set back over the horizontal moulding over the aisle windows; this clerestory level of the eastern wall was built on its own, with its clerestory vaulting caps, as can be seen in joints of each side from within the roof.
- Primary Sources for Dating
1156/62 - GAILLON
The spire.
… in 1156 built the first foundations of seventeen parish churches in the country near their capital city Meulun, all of the buildings were achieved in less than six or seven years with towers of cut stone and of such fine structure as those which can be seen today in the parishes of Gavancourt, Clery, Condecourt, Gaillon, Tepancourt, Hardicourt, Jambville, Livray, and several others,…

Lévrier, Memoires historiques sur les ville, comté, baillage et siège principal de Meullent, 1767, fol. 136.