What I have here written will no doubt be supplemented and corrected by others hereafter; and much additional light will, I hope, be thrown upon the history of Spanish buildings and their architects. It will be found that I have referred to many Spanish authorities for the historical facts on which the dates of the buildings I have visited can alone be decided. Of these authorities none is more useful to the architect, none is more creditable to its authors, than the ‘Notices of the Architects and Architecture of Spain, by D. Eugenio Llaguno y Amirola, edited with additions by D. Juan Agustin Cean-Bermudez,’ in four volumes, compiled about the beginning of this century, but not published until A.D. 1829.[1] This work, full of documentary evidence as to the Spanish architects and their works, appears to me to be far better in its scheme and mode of execution than any work which we in England have upon the buildings of our own country; and, though it is true that neither of its authors had a very accurate knowledge of the art, they seem to have exercised great diligence in their search after information bearing on their subject, and to have been remarkably successful. Mr. Ford’s ‘Handbook of Spain’ has been of great service to me, not only because it was the only guide to be had, and on account of the charm of his style, but because it had the rare excellence (in a Guide-book) of constantly referring to local guides and authorities, and so enabling me to turn at once to the books most likely to aid me in my work. The other works to which I have at some pains referred are mainly local guides and histories, collections of documents, and the like. Of these a vast number have been published, and I cannot pretend to have exhausted the stores which they contain. Unfortunately, so far as I have been able to learn, no one of late years has taken up the subject of the Mediæval antiquities of Spain in the way in which we are accustomed to see them treated by writers on the subject elsewhere in Europe. The ‘Ensayo Historico’ of D. José Caveda is very slight and unsatisfactory, and not to be depended on. Passavant, who has published some notes on Spanish architecture,[2] is so ludicrously wrong in most of his statements that it seems probable that he trusted to his internal consciousness instead of to personal inspection for his facts. The work of Don G. P. de Villa Amil[3] is very showy and very untrustworthy; and that of Don F. J. Parcerisa,[4] and the great work which the Spanish Government is publishing,[5] are both so large and elaborate as to be useless for the purpose of giving such a general and comprehensive idea of the features of Gothic architecture in Spain as it has been my effort to give in this work.