Which Mauryan emperor systematically used the honorific name 'Piyadasi' (He who looks on with affection) in his official royal edicts and declarations?

Emperor Ashoka referred to himself in most of his major rock and pillar inscriptions using the titles Devanampiya (Beloved of the Gods) and Piyadasi (Pleasant to behold / He who looks on with affection). This identity was definitively confirmed following the decipherment of the Maski edict.