By 1223, the nave had been completed and subsequently, the relics of Saint Samson were brought back to the cathedral from Normandy to where they had been taken for reasons of security. The nave has seven crossings and the classical gothic elevation of arcades, triforium and high windows with a walkway beneath them. De Lizaunet's successor Clément de Vitré (known as Clément de Coetquen or de Coetquin) saw to the construction of the transept and the choir. The choir has five crossings and ten side chapels and terminates with a rectangular chevet. The presence of the relics of saint Samson attracted pilgrims and this necessitated the addition of an ambulatory. The choir, ambulatory and ten side chapels around the ambulatory were completed by 1279. The cathedral was now functional although it's Gothic towers had still to be constructed.