What caused the persian empire an others to attack an invade byzantium

The Byzantine Empire was a vast and powerful civilization with origins that can be traced to 330 A.D., when the Roman emperor Constantine I dedicated a “New Rome” on the site of the ancient Greek colony of Byzantium.

1. they could both use a veto to cancel an action.

2. women couldn't vote in the roman republic but could in the united states

the scientific revolution brought us a renewed understanding of humanity and our place in the universe, new scientific equipment, and new laws as a basis for future scientific discovery.