If ranked by population percentage, the Achaemenid Empire, also known as the First Persian Empire, is the largest Empire the world has ever seen with 44% of the world's population belonging to it. But despite its remarkable conquests, riches, and astonishing achievements in fields such as engineering, the Achaemenid Empire has remained shrouded in mystery. But that is about to change. In this new captivating history book, you will discover the truth about this startling empire.