Note 481 — Chapter VII · THE KINGDOM OF ALBAN.
Reading edition
If Donald was under age in 878 when the succession, according to this law, opened to him, it is probable that the cause of the revolution was his arriving at an age sufficient to satisfy the requirements of the law, which demanded that the throne should only be filled by an adult. Kenneth dying in 860, supposing him born in 800, and his son Constantin in 830, Donald could not have been born before 860, but if born in 864, he would be twenty-five in 889.