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to choir walls, remodelling of the clerestories: pointed arched windows are enlarged downward, replacing the triforia, and get tracery.
* 1235-1245 - Chapels constructed between buttresses of nave and choir.
* 1250-1260 - North transept lengthened by Jean de Chelles to provide more light. North rose window constructed.
* 1270 - South transept and rose window completed by Pierre de Montreuil.

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