"A History of Mediaeval Jewish Philosophy" is a book by Isaac Gusyk, which is an important source for the study of Jewish philosophy in the Middle Ages. In this work, the author examines the philosophical thoughts of Jewish thinkers in the Middle Ages, revealing their contribution to the world's philosophical heritage. Husyk examines in detail the views and ideas of such philosophers as Saadiah Gaon, Maimonides, and Gershom Ben Yehuda. This book is an important source for anyone interested in the development of philosophy in the context of medieval Jewish culture.