In 44AD, Herod Agrippa I, last King of the Jews, died suddenly. His overlord, Emperor Claudius, wanted to install the late king’s seventeen year old son, Herod Agrippa II, as successor, but was dissuaded by his advisors at Rome who argued that the youth was could not govern such a turbulent realm (Judea/Israel). Judea was thereupon annexed to the Roman Empire.
In 1823 Emperor Augustin I of Mexico was deposed. His six year old son, Crown Prince Augustin, was too young to succeed, and Mexico became a republic.
In 1870 he same thing happened in France; Emperor Napoleons III’s son, the Prince Imperial was only fourteen and thus unable to save the monarchy.
In 1889, Emperor Pedro II of Brazil was deposed leaving no male successor (both his sons had died).
Similarly, in 1953 King Farouk of Egypt was deposed, leaving a one year old heir (Faud II). The same year, a republic was proclaimed.
In 1973, King Constantine II of Greece was likewise ousted while his son, Crown Prince Pavlos was only six years old.
The same process ensued in Iran when the last Shah was deposed in 1979. His son, Crown Prince Reza Pahlevi, was nineteen and thus below the minimum legal age to succeed there (twenty-one). In 2003, Ilham Aliyev succeeded his father, Haydar Aliyev, as President of Azerbaijan.