high, built of stone from the Pisan hills, weathered for the most part to a grayish hue. The masonry of the lower half is good. The blocks of stone are large and well laid. Those of the upper half are smaller and the masonry is in places careless and irregular. The red brick battlements are square. At short intervals there are walled-up gateways, round-headed or ogival in form, and the whole surface is rent and patched. Centuries of war and earthquakes, rain and fire, have given it a pleasant irregularity, the record of violent and troublous times.

The city can be reentered by the Porta Nuova, only a few yards to the left of the cemetery. So venerable do these battered walls look that we need the full evidence of history to realize that they had more than one predecessor. The memory even of the first walls of Pisa, an ancient city when Rome was young, has been lost. The earliest record of which we know anything appears on a map of the ninth century drawn by one Bonanno; a map, we should rather say professing to be of the ninth century, for churches of the thirteenth century are marked upon it, so it must either have been made, or the churches inserted, then....

The ancient walls were practically swept away by the prosperity of Pisa. Beside the Balearic Islands she had conquered Carthage, the Lipari Islands, Elba, Corsica, and Palermo, and her galleys poured their spoils into the Pisan port. She traded with the East, and was successful in commerce as in war. Her inhabitants increased rapidly. They could no longer be penned within the narrow limits of the old wall, but overflowed in all directions beyond it. Not only was the Borgo thickly populated, but a whole new region called Forisportae, sprang up.

So masked was the wall by houses, built into it and huddling against it both on the outside and the inside, that it seems to have been actually invisible. So much so that contemporary chroniclers spoke of Pisa as without walls, and attributed her safety to the valor of her citizens and the multitude of her towers. The ancient wall was evidently so hidden and decayed that Pisa must be regarded as a defenseless city in the twelfth century. It is curious that her citizens should have neglected their own safety at a time when they were masters of fortification and defense; when their fame in these arts had reached as far as Egypt and Syria, and when the Milanese came to them to beg for engineers....

The external appearance of an Italian city in the twelfth century was so unlike anything we are accustomed to in modern times that a strong effort of the imagination is needed to conceive it. Seen from a distance the walls enclosed, not houses, but a forest of tall square shafts, rising into the sky like the crowded chimney stacks in a manufacturing town but far more thickly set together. The city appeared, to use a graphic contemporary metaphor, like a sheaf of corn bound together by its walls.