What Did the Ancient Persians Invent?

The ancient Persian leaders worked hard to ensure their empire succeeded. To do this, they invented their own taxation system and various universal laws to encourage cooperation from the people. They also standardized weights and developed a mail delivery system. The mail delivery system was a major communication route for the leaders and the people of the empire. Throughout time, many Persians made major contributions to science and medicine. The empire was one of the large in history.