Florence cathedral_The basilican body in Brunelleschi’s time

A dangerous situation for the basilican body developed during the construction of the dome. Mention of it was first made in a resolution passed in January 1431, which referred to uncertainties about the structural strength of the cathedral aisles, which threatened to collapse. Filippo Brunelleschi, Lorenzo Bartoli and Battista d’Antonio were involved in the design of the reinforcements, but the creator of the model was Brunelleschi. A document attests that the installation in the nave of the first double tie, under the guidance of Brunelleschi and the master builder, dates back to March 1434.