After this there was founded with his design, in the year 1294, the Church of S. Croce, where the Friars Minor have their seat. What with the middle nave and the two lesser ones Arnolfo constructed this so wide, that, being unable to make the vaulting below the roof by reason of the too great space, he, with much judgment, caused arches to be made from pier to pier, and upon these he placed the roofs on a slope, building stone gutters over the said arches in order to carry away the rain-water, and giving them so much fall as to make the roofs secure, as they are, from the danger of rotting; which device was not only new and ingenious then, but is equally useful and worthy of being considered to-day. He then gave the design for the first cloisters of the old convent of that church, and a little time after he caused to be removed from round the Church of S. Giovanni, on the outer side, all the arches and tombs of marble and grey-stone that were there, and had part of them placed behind the campanile on the facade of the Canon's house, beside the Company of S. Zanobi; and then he incrusted with black marble from Prato all the eight outer walls of the said S. Giovanni, removing the grey-stone that there had been before between these ancient marbles. The Florentines, in the meanwhile, wishing to build walls in the Valdarno di Sopra round Castello di San Giovanni and Castel Franco, for the convenience of the city and of their victualling by means of the markets, Arnolfo made the design for them in the year 1295, and satisfied them in such a manner, as well in this as he had done in the other works, that he was made citizen of Florence.