Question: Greek fire provided a technilogical advantage and victory during the salvation of what city which is also the capital city of the Roman/Byzantine from two Arab sieges?
Sentence (from "Siege of Nicaea (727)"): The successful repulsion of the attack was a major boost for Byzantine emperor Leo III the Isaurian's recently initiated campaign to abolish the veneration of icons in the Empire; Leo claimed it as evidence of divine favour for his policy.
Relevant evidence: No