For the first time, a book has been published in Russian, describing in detail and in a lively, exciting form not only all the Crusades, but almost two centuries of life of the Crusader states. The author pays great attention to the military-political and diplomatic aspects of the greatest epic of the struggle between two world religions - Christianity and Islam. The enormous factual material collected in the book is of interest equally to historians and to a wide range of readers. The book is accompanied by numerous illustrations, maps and genealogical tables.