It was tattered, weakened, bent and finally removed by the wind over the 5th century in 1786. The original spire was built in the 13th century, probably between 12. Using a four-part rib vault instead of a six-part rib vault can make the roof stronger and taller.Īfter the original structure was completed in the mid-13th century and after the dedication of the high altar in 1182, the flying buttress was invented and added to distribute the weight of the powerful vault. The roof of the nave was supported by intersecting ribs that divided each vault into compartments. The roof of the nave was constructed with a new technology called rib vault. The cornerstone was placed in front of Pope Alexander III in 1163, and the construction of the initial structure was completed in 1260.
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