After he became one of the Seven Great World Powers, Rudeus stopped making appearances on the front stage.
The reason why his popularity was lower than the great men of same generation as his was because of that.
(People that came out who basically replaced Rudeus from his position were 『The Seven Star Witch』 Silent Seven Star or Roxy M. Greyrat who was now the Headmaster of Magic University. They were more popular.)
Therefore, not many knew that he was the Seventh Rank of the Seven Great World Powers.
It was theorized that maybe Rudeus himself had died after the Battle of Biheiril Kingdom and the one who came out was a body double or that only his name remained. However, due to the records left behind which stated that the establishment of Ariel National University was directly affected by him, it was quickly dispelled.
It was unknown just why Rudeus was trying so hard to hide himself from the front stage.
The records stated that he became the subordinate of Dragon God Orsted, and became friends with Zanoba Shirone - President of the Doll Company, Cliff Grimoire - Pope of the Milis Religious Organization, Miko of Milis, Ariel Anemoi Asura - Queen of Asura Kingdom, Death God Randolf of the Dragon King Kingdom, and Immortal Demon Lord Atofe of the Demon Continent. In order to prepare the world for Laplace’s resurrection 80 years later, he was trying to unite the world as one.
Meanwhile, he broke the taboo and brought back the usage of the Teleport Formation to the world. There were many books written that called him a great criminal for using the convenient capabilities to plot world domination.