RARE COMPLETE FIVE VOLUME SET of the BILINGUAL HEBREW-ENGLISH critical edition of one of the most important Jewish medieval theological treatises - Sefer ha-Ikkarim ("Book of Principles"), written by the influential philosopher and rabbi Joseph Albo (c.1388-1444). [ALL VOLUMES]: 170x115mm. XXVIII+1371 double pages (pagination: XXVIII+204+219+351+272/273-597). Blue cloth Hardcover with gilt front cover and spine. Text block upper edge gilt. Cover rubbed and slightly yellowing. Spine rubbed and yellowing. Spine gilt lettering faded/partly peeled. Cover corners and spine edges bumped. Spine edges peeling. Previous owner name written in pen on front endpaper and/or whitepage. Pages yellowing. [VOL.I]: Rear cover stained. [VOL.III]: Two first pages corner/edge creased. [VOL.IV, part 1]: Pen mark on front endpaper upper edge. [SUMMARY]: This extremely rare complete five volume critical edition of the classic 15th-century work on the fundamentals of Judaism is otherwise in good condition.