Otho of Freysinghen was nearly related to the emperor Conrad, whom he accompanied on his unfortunate expedition. Both these authors, therefore, had the best means of obtaining information; and in the writings of each there is an air of truth and sincerity, which does much towards conviction. I have had occasion in speaking of this crusade to cite casually a number of authors, of whom it is not necessary to give any very detailed account. Their works are to be found in the admirable collections of Dom Bouquet, Duchesne, Martenne, or Muratori. Wherever I have been obliged to quote from any of the Arabian writers, I am indebted to the extracts of Monsieur Reinaud. In regard to the crusade of Richard Coeur de Lion and Philip Augustus; for the history of the first, I have borrowed from Benedict of Peterborough, from Hovedon, and especially from Vinesauf, whose work is inestimable. These, with the other English authorities I have cited, are too well known to need comment. Having some time ago written a romance, not yet published, on the history of Philip Augustus, I had previously studied almost all the old chroniclers who speak of that monarch. The most important treatise on his reign is the work of Rigord, who was at once monk, physician, and historiographer at the court of Philip. William the Breton, one of the king's chaplains, continued his history in prose, from the period where Rigord abandoned the task. He also wrote a bombastic poem on the reign of his patron, which, however exaggerated and absurd, is useful as an historical document, and a painting of the manners and customs of the time. On the taking of Constantinople by the French, I have found no want of authorities. Villehardouin, one of the principal actors in the scenes he describes, has been my chief source of information. I have also met with much in Nicetas, who was present; and I have confirmed the evidence of other writers, by the chronicle in the Rouchy dialect, published by Monsieur Buchon, and by the metrical chronicle of Philippe Mouskes in the same collection. I need hardly say that the works of Ducange have proved invaluable in every part of my inquiry, and that his history of Constantinople under its French monarchs both gave me facts and led me to authorities. Joinville is the principal writer on the crusade of St. Louis. He was an eyewitness, a sufferer, and a principal actor in the scenes he describes. Of all old chroniclers, with the exception, perhaps, of Froissart, Joinville offers the most original, simple, and delightful painting of times and manners long gone by. With the notes of Ducange, his work is an erudite repertory for antique manners and usages, and may be read and reread with gratification, and studied deeply with advantage.