Note 058
Vanity prompted the Arabs to believe that Thomas was the son-in-law of the emperor. We know the children of Heraclius by his two wives; and his august daughter would not have married in exile at Damascus (see Ducange, Fam. Byzantin. p. 118, 119). Had he been less religious, I might only suspect the legitimacy of the damsel.

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The History Of The Decline And Fall Of The Roman Empire —Fall In The East —Chapter 51