But the House of Aviz, like the legitimate line of Affonso Henriques, dwindled into debility. It flickered out in Dom Sebastian, who dragged his country into a mad invasion of Morocco and vanished from human ken on the disastrous battlefield of Alcazar-Khebir. Then, for sixty years, not by conquest, but by intrigue, Portugal passed under the sway of Spain, and lost to the enemies of Spain--that is to say, to England and Holland--a large part of her colonial empire. At last, in 1640, a well-planned and daring revolution expelled the Spanish intruders, and placed on the throne John, Duke of Braganza. As the house of Aviz was an illegitimate branch of the stock of Affonso Henriques, so the Braganzas were an illegitimate branch of the House of Aviz, with none of the Plantagenet blood in them. Only one prince of the line, Pedro II., can be said to have attained anything like greatness. Another, Joseph, had the sense to give a free hand to an able, if despotic, minister, the Marquis of Pombal. But, on the whole, the history of the Braganza rule was one of steady decadence, until the second half of the nineteenth century found the country one of the most backward in Europe. Nor was there any comfort to be found in the economic aspect of the case. A country of glorious fertility and ideal climatic conditions, inhabited by an industrious peasantry, Portugal was nevertheless so poor that much of its remaining strength was year by year being drained away by emigration. The public debt was almost as heavy per head of population as that of England. Taxation was crushing. The barest necessaries of life were subject to heavy imposts. Protection protected, not industries, but monopolies and vested interests. In short, the material condition of the country was as distressing as its spiritual state to any one with the smallest sense of enlightened patriotism.