Author: Charles Diehl (1859–1944) – one of the most important Byzantinists of the early 20th century.
Edition: Rutgers University Press, 1957 (first English edition, translated by Naomi Walford, with intro by Peter Charanis).
Condition: Dust jacket present (HUGE plus), though I see some edge wear and a tear at the top—still, way better than a naked copy.