User blog comment:ImperiexSeed/ARCHANGEL or LEVIATHAN!/@comment-3481504-20120526012314/@comment-1975828-20160626192604

The fact that Leviathans seem so Earth-bound (they don't fly, don't have wings) makes me think the Archangels are older. Though in terms of canon, it is unconfirmed, since we don't know the gap between Gabriel and the first angel. Maybe God made Leviathans then the first angel, or made the Leviathans then the first archangel/Michael. There's no proof yet.