All Roman roads were not built with so much care and in such an enduring fashion; they were, however, all of them substantial enough to resist for centuries, and they remained in use during the Middle Ages. Other roads besides were opened during that epoch to provide for new fortified towns and castles, and to satisfy the needs of great landowners, religious or otherwise. The keeping of roads and bridges in repair, the latter included in the _trinoda necessitas_, was not considered as worldly, but rather as pious and meritorious work before God, of the same sort as visiting the sick or caring for the poor;[6] men saw in them a true charity for a certain category of sufferers, namely, travellers; this is why the clergy submitted to it. The pious character of this kind of {32} labour may suffice to prove that the roads were not so safe or in such a good state as has been sometimes maintained.[7] The noblest outcome of the religious spirit prevalent in the Middle Ages was that disinterested enthusiasm which, as soon as some distress of humanity became flagrant, created societies for help and rendered self-denial popular. One of these distresses was seen, for example, in the power of the infidel, and the Crusades were the consequence. The forsaken condition of the lowest classes in the towns was noticed in the thirteenth century, and St. Francis sent for the consolation of the neglected, those mendicant friars at first so justly popular, and who so promptly fell into disrepute. After the same fashion travellers were considered as sufferers deserving pity, and help was given to them to please God. A religious order with this end in view had been founded in the twelfth century, that of the _Pontiff_ brothers, or makers of bridges (_pons_, bridge), which spread into several countries of the Continent.[8] In France they built over the Rhône the celebrated bridge of Avignon, which yet preserves four arches of their construction; and the one at Pont St. Esprit, which is still in use, nineteen out of its twenty-five arches dating from the years 1265 to 1309 when it was erected. To break the force of such a current as that of the Rhône they built, near together, piers of oblong form, ending in a sharp angle at the two extremities of their axis,[9] and their masonry was {35} so solid that in many places the waters have respected it to the present day, that is, for eight centuries. They also had establishments on the banks of rivers, and helped to cross them by boat. Their most memorable accomplishment was, however, the replacing of the same ferries and of short-lived, often dangerous timber bridges by stone ones, the normal progression for river crossing being, throughout ages, the ford, the ferry, the timber bridge, the stone bridge. Laymen learnt the secret of their art and in the thirteenth century began to take their place. Bridges multiplied in France; many still exist, such, for example, as the