The Maou (Demon King) is the ruler of all Mazoku. The position of the Maou is not determined by social standing or heredity. They are decided by Shinou's word and one day a messenger suddenly appears to call on them. Usually once their term as Maou is done, they return to their hometowns and live the rest of their days as normal.
There were 26 Maous before Yuuri, making him the 27th Demon King of Shin Makoku.
|Order of Succession||Name||Nickname||Status (Prior to Ascendancy)|
|1||Shinou||Noble (Son of the King of another Kingdom)|
|7||Lord Folger von Voltaire||Noble|
|14||Lady Brittany von Wincott||The Bloodshed King||Noble|
|15||Yaft Trintignant Grisela||The Beheader||Commoner|
|19||Lord Basilio von Rochefort||The Cruel||Noble|
|20||Henstridge Davidson||The Slaughterer||Commoner|
|21||Lord Dwayne von Gyllenhall||The Belligerent||Noble|
|22||Arsenio Ropelewski||The Mighty Warrior King||Commoner|
|23||Lord Jeannot von Karbelnikoff||The Stern||Noble|
|24||Lord Beltran von Radford||The Lion King||Noble|
|26||Lady Cacilie von Spitzweg||Noble|
Maou of Earth
The names of all former Maous starting from the 24th Maou and ending with the first are told to Yuuri by Gunter in Volume 1, Chapter 3. In the same chapter, Cacilie is introduced.
Information on Chevalier being the 25th Maou is revealed in Volume 16, Chapter 7.