Ardal aep Dahy was a Nilfgaardian nobleman and the leader of the East Army Group during the Northern Wars. Later, along with Joachim de Wett, Count d'Arvy, Berengar Leuvaarden, the Count of Broinne and Stefan Skellen, he conspired to remove Emhyr var Emreis from the imperial throne and put Morvran Voorhis in his place.