What is the primary reason to have 3 branches of government

To ensure the separation of powers as well as to ensure the governments is effective and the citizens' rights. This means each branch has it's own powers and responsibilities, including working with the other branches.

“the iliad” (gr: “iliás”) is an epic poem by the ancient greek poet homer, which recounts some of the significant events of the final weeks of the trojan war and the greek siege of the city of troy (which was also known as ilion, ilios or ilium in ancient times).