Indeed it may be said that tilework is the most characteristic feature of Portuguese buildings, and that to it many a church, otherwise poor and even mean, owes whatever interest or beauty it possesses. Without tiles, rooms like the _Sala das Sereias_ or the _Sala dos Arabes_ would be plain whitewashed featureless apartments, with them they have a charm and a romance not easy to find anywhere but in the East. CHAPTER I THE EARLY BUILDINGS IN THE NORTH Portugal, like all the other Christian kingdoms of the Peninsula, having begun in the north, first as a county or march land subject to the king of Galicia or of Leon, and later, since 1139, as an independent kingdom, it is but natural to find nearly all the oldest buildings in those parts of the country which, earliest freed from the Moslem dominion, formed the original county. The province of Entre Minho-e-Douro has always been held by the Portuguese to be the most beautiful part of their country, and it would be difficult to find anywhere valleys more beautiful than those of the Lima, the Cavado, or the Ave. Except the mountain range of the Marão which divides this province from the wilder and drier Tras-os-Montes, or the Gerez which separates the upper waters of the Cavado and of the Lima, and at the same time forms part of the northern frontier of Portugal, the hills are nowhere of great height. They are all well covered with woods, mostly of pine, and wherever a piece of tolerably level ground can be found they are cultivated with the care of a garden. All along the valleys, and even high up the hillsides among the huge granite boulders, there is a continuous succession of small villages. Many of these, lying far from railway or highroad, can only be reached by narrow and uneven paths, along which no carriage can pass except the heavy creaking carts drawn by the beautiful large long-horned oxen whose broad and splendidly carved yokes are so remarkable a feature of the country lying between the Vouga and the Cavado.[31] In many of these villages may still be seen churches built soon after the expulsion of the Moors, and long before the establishment of the Monarchy. Many of them originally belonged to some monastic body. Of these the larger part have been altered and spoiled during the seventeenth or eighteenth centuries, when, after the expulsion of the Spaniards, the country began again to grow rich from trade with the recovered colony of Brazil. Still enough remains to show that these old romanesque churches differed in no very striking way from the general romanesque introduced into Northern Spain from France, except that as a rule they were smaller and ruder, and were but seldom vaulted.