You would wrap them with Toilet paper..... DUH!
Answer:
Khalifa Umar ibn Al-Khattab created the Hijiri calendar.
Monarchs (Kings or Queens) used the concept of divine right (saying God chose them to be ruler) to support absolute rule (only one ruler in charge, no parlament or government) by stating that they were the only ones worthy of the thrown because God had supposedly chosen them.
Hope that helps :)