Regarded as an advised statesman and a born leader, Constantin IV fought with firmness against the Arabs (first seat of Constantinople by the Arab (674 - 678) and overcame them into 678 thanks to the use of the Greek fire which set fire to the Arab fleet. A peace treaty thirty years was concluded with the caliph, who committed himself paying an annual tribute.
Constantin IV failed however vis-a-vis an attack of the Bulgarian ones, which settled with Pliska and due to pay them tribute.
He died of dysentery into 685.
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