mortal foe

“A zealous votary of the idols, a mortal foe of the line of Hashem, he convened an assembly of the Koreishites and their allies, to decide the fate of the apostle.”

The History of the Decline and Fall of the Roman Empire

“Garganus in Apulia, which had been sanctified by the apparition of the archangel Michael, 18 they were accosted by a stranger in the Greek habit, but who soon revealed himself as a rebel, a fugitive, and a mortal foe of the”

The History of the Decline and Fall of the Roman Empire