If the regnal years of the kings of Israel from Jeroboam toJehoram be added together, they will be found to amount to 98, while if those of the kings of Judah for the same period (viz.
Records of the time that has elapsed between two regnal dates in the reigns of different kings are very helpful; thus stelae from the Serapeum recording the ages of the Apis bulls with the dates of their birth and death have fixed the chronology of the XXVIth Dynasty.
But when we proceed to add up similarly the regnal years in the two kingdoms from the division after Solomon's death to the fall of Samaria in the sixth year of Hezekiah (2 Kings xviii.
It is significant in this connexion that it was under Adrian (c. 774) that the papal chancery ceased to date by the regnal years of the Eastern emperor and substituted that of the pontificate.
The careful statement of the ages of the animals in the later instances, with the regnal dates for their birth, enthronization and death have thrown much light on the chronology from the XXIInd dynasty onwards.
The compiler of this work, however, seems to have used a regnal list of the Bernician kings, which differed considerably from most of those found in our early authorities.