This book describes events at Edessa, largely through contemporary accounts and incorporates much new material, notably six mosaics found by the writer between 1952 and 1959.

The only detailed study of the diacritical and vocalization system of Syriac. Segal examines the history and usage of the diacritical point, from before the seventh century, up to the thirteenth century, taking into account both the East and West Syriac traditions.