In 539 BCE Cyrus invaded the Babylonian Empire, following the banks of the Gyndes (Diyala) on his way to Babylon
Cyrus’s most renowned act of mercy was to free the captive Jews, whom Nebuchadrezzar II had forced into exile in Babylon. Cyrus allowed them to return to their promised land. The Jews praised the Persian emperor in scripture as a savior to whom God gave power over other kingdoms so that he would restore them to Jerusalem and allow them to rebuild their Temple
Efficiency: the government may be more efficient because a few people take all the decisions, with barely or any opposition, which can make any process run faster.
Order: the government can more easily impart order in society because its authority is unopposed. This can reduce crime, and improve public safety.
Disadvatanges:
Authoritarianism: a government concentrated in a few hands can become very authoritarian, to the point of violating the human rights of those who oppose it.
Totalitarianism: this type of government can become so authoritarian that it turns into a totalitarian government: one that controls every aspect of its citizens: from the people they vote for, to the way they dress.
Corruption: a government without opposition, concentrated in a few hands, can easily become corrupt, and reduce the welfare of its citizens because of that.
The religion your asking about is the Protestant Reformation because there were issues from the Pope and Catholic Church that now today Protestants don't agree with.
