Euthymios Zigabenos

Euthymius Zigabenus or Zigadenus or Zygadenus (Greek: Εὐθύμιος Ζιγαβηνός or Ζυγαδηνός; died after 1118) was a 12th-century monk and commentator on the Bible.

He was a friend of the Byzantine emperor Alexius I Comnenus, for whom he wrote a lengthy work on heresies, Panoplia Dogmatica or Panoply of Doctrine (or "Full Armour of Belief").

He was favoured by both the emperor and his daughter Anna Comnena, who extols his learning and piety in her Alexiad.

Spurious works under his name include "The Exposition of the Nicene-Constantinople Creed" and "Dialogue with a Muslim".

Bruce Metzger argued that "No Greek Church Father prior to Euthymius Zigabenus (twelfth century) comments on this passage, and Euthymius declares that the accurate copies of the Gospel do not contain it".