In dealing with so wide-ranging a subject, a remark of an American scholar, Mr. Hoey, on the intimate connection between the titles pius, felix, and invictus provides a convenient starting-point.The first observation I would make is to call your attention to the consecutive (and almost causal) connection of these adjectives : because the Emperor is pius the gods will render him felix (for felicitas is their gift to their favourites) and his felicitas is best demonstrated in his being invictus. Nearly every nation of antiquity believed and hoped that its gods would bring it success : the Roman People, with seven centuries of expansion and increasing power to look back on, were convinced that their scrupulous attention to the due performance of the proper rites had won them this success, that their pietas had secured to them victoria; if the Emperor could be termed pius felix invictus, it was because he summed up and incarnated there the Roman People.
