I am wondering tough is what title of Maou stands for. What is known about it up till now:

- Maou is usually translated into Devil or Demon King
- Sanmoto Gorouzaemon and Abe no Seimei both call themselves Maou's
- "Master of all Yokai" seems to be the title of the strongest Yokai so I guess it does not represent ultimate power
- Sanmoto's Heart, which became a sword, is called Maou's Hammer and is right now in possession of Seimei

What do you guys think the title stands for?
Also, does anyone know some legends that has Maou's in it?