Grzegorz Leopold Seidler, as author 217 publications, the mast important book is Przedmarksowska myśl polityczna (Premarxian Political Thought) with two editions. This book is based on his earlier books such as Myśl polityczna starozytności (Ancient Political Thought), Myśl polityczna średniowiecza (Middle Ages Political Thought) and Myśl polityczna czasow nowozytnych (Modern Times Political Thought). Mentioned above books are authors attempts both present methodology and the history of the political thought from its Eastern beginnings to the times of the influences Marxian political thought, mainly in socialist countries, including Poland. Przedmarksowska myśl polityczna summarise those attempts but with limited authors success. My research has analytical character, devoted to Przedmarksowska myśl polityczna in the light of the many commentators opinions and evaluations – positive and negative. Polish commentators of those book, in they majority, evaluate its as a great, original, complex presentation almost all fundamental issues of the discipline known as Historia doktryn politycznych (The History of the Political Thought), Historia doktryn politycznych i prawnych (The History of the Political and Juridical Thought) or Historia doktryn polityczno-prawnych (The History of the Politically-Juridical Thought). Commentators from abroad of Poland usually were much more critical. I contrast, from many different points of view, book Przedmarksowska myśl polityczna with my book Wspolczesne doktryny polityczne (Contemporary Political Thought).