A Zaku is a monarch or ruler that lives on the island of Y'aaj.                         

Statue of a Zaku


To become a Zaku, you must be a Y'aajese person and you also must have been born on the island of Y'aaj.  When a Zaku dies, strong military men stand in line in a ceremony.  They only choose three of the men to be candidates to the throne of Zaku and they have the three men fight in a battle to the death.  When one wins, he will be crowned Zaku, monarch of Y'aaj.  To be Zaku, you must have also had to have slain a Feengax