The Fount of Knowledge sums up Greek theology for a new age, and its third part, On the Orthodox Faith, became a standard handbook. Three treatises defend the holy images against the imperial ban.

John of Damascus
Monk of Mar Saba
John of Damascus (c. 675–749) was a monk at Mar Saba near Jerusalem. He had served in the fiscal administration of the caliph before he left for the monastery.
- Dates
- c. 675–749
- Role
- Monk of Mar Saba
- See
- Syria