For this first siege of Constantinople, see Nicephorus (Breviar. p. 21, 22); Theophanes (Chronograph. p. 294); Cedrenus (Compend. p. 437); Zonaras (Hist. tom. ii. l. xiv. p. 89); Elmacin (Hist. Saracen. p. 56, 57); Abulfeda (Annal. Moslem. p. 107, 108, vers. Reiske); D'Herbelot (Bibliot. Orient. Constantinah); Ockley's History of the Saracens, vol. ii. p. 127, 128.