If, when the cathedral has been thoroughly studied, one goes out through the cloister, an external door at its north-western angle leads out to the top of a steep path from which an extremely picturesque view is obtained. The old town walls girt the cathedral on the north side; but in the eleventh century it was thought well to add to them, and a second wall descends, crosses the valley below, and rises against the opposite hill in a very picturesque fashion. This wall has the passage-way perfect all round, and occasional circular towers project from it. The eye is at once caught in looking at this view by a fine Romanesque church with a half-ruined cloister and lofty octagonal steeple, which seems to be absolutely built across and through the walls. This is the Benedictine church of San Pedro de los Galligans;[336] and a closer inspection shows that what at first looks like the round-tower of the town walls, against which the church has been built, is really the very apse of the church, which when the new walls were built was raised and converted above into a purely military work. The earliest reference to this church that I have found is a statement that it existed in the tenth century, and that, in A.D. 1117, the Count Ramon of Barcelona gave it to the Benedictine convent of Sta. Maria de la Crassa, in the bishopric of Carcassonne, of which his brother was Abbat; and I think we may safely assume that the whole of the existing church was built within a short time of its transfer from the hands of the Secular to those of the Regular Clergy.