Sparta
Sparta had a government with checks and balances.  The executive branch was led by two kings.  The legislative branch was led by the citizens. and the judicial branch was controlled by the elders.  There was also a committee of five men who were in charge of the education process that young boys and girls went through.  Boys and girls were taken from their parents at the age of 7.  Boys went to live in barracks with other boys their age.  Girls went to school to learn gymnastics, wrestling, and other activities, so they could become strong, healthy mothers for future soldiers.