Examples from the Web for regnal
The regnal year is uniformly "one;" the mint-marks are Zadracarta, Iran, and Nihach, an unknown locality.
But his successors introduced their own regnal reckonings; and that prevented it from acquiring permanence.
In process of time, however, the custom of dating by the regnal year of the king became general.
Probably neither the Sothic nor any other era was employed by the ancient Egyptians, who dated solely by regnal years (see below).
The reverse shows the regnal year, which ranges from eleven to forty-three, together with a mint-mark.