Panoplia dogmatikē tēs orthodoxou pisteōs

The Panoplia dogmatikē tēs orthodoxou pisteōs (The Doctrinal Armory of the Orthodox Faith) is an encyclopedic work by the Byzantine theologian Euthymius Zigabenus, written in the 12th century. Commissioned by Emperor Alexius I Comnenus, it served as a comprehensive defense of Greek Orthodoxy against heresies.

The work is divided into two main sections. The first addresses early Christian heresies, particularly concerning the doctrines of the Trinity and Christology. The second section details theological disputes from Jewish criticisms to controversies with Roman theologians. This work is a crucial source for understanding early and medieval theological debates, especially regarding the Bogomil sect. Nicetas Choniates also composed a work with a similar title, the Panoplia Dogmatike (Thesaurus of Orthodoxy), which collected tracts for theological responses.12