The Prophecy of the Twelve Eagles

That Rome should ever fall was unthinkable to Romans: its foundations were unassailable, sturdily sunk in a storied past and steadily built on for eleven centuries and more. There was, of course, the prophecy. Someone, usually someone in his cups, could always be counted on to bring up that old saw: the Prophecy of the Twelve Eagles, each eagle representing a century, leaving us with – stubby fingers counting out the decades in a puddle of wine – only seventy years remaining! Give or take a decade! Predictable laughter at the silliness of the whole idea. But in seventy years exactly, the empire would be gone.

Cahill, How the Irish Saved Civilization, p. 12.