君士坦丁堡的城防指挥官是牧首塞尔吉乌斯一世(英语:SergiusIofConstantinople)和将军博努斯。希拉克略皇帝当时率军在外,收到敌人围攻首都消息后,他将军队分为三部分,虽不担心城防,但还是向首都派出一支援军以鼓舞守军的士气;第二部分军队由他的弟弟狄奥多尔(英语:Theodore (brother of
Pope SergiusI (687–701) refused to sign, and the canons were never fully accepted by the Western Church". Milton V. Anastos, Aspects of the Mind of Byzantium