In K407, at the Buena Village in the Fittoa Country of the Asura Kingdom, he was born as the eldest son to a father who was a low class Knight of the Asura Kingdom, Paul (K388 - K423), and to a mother who was a former adventurer and healer, Zenith (K390 - K459).
Rudeus from his infancy was able to use Intermediate Level magic when he was 3. Paul, who anticipated that talent of his, called Roxy Migurdia (K373 - ) as a private tutor to educate him.
As a result of his hard training, he could use Saint Level Water Magic by the time he reached 5.
Although he displayed talent capable of surpassing his own mentor, he still honored her until his very death.
When he turned 7, and after discovering his talent, he was invited to be a private tutor by the Feudal Lord of Fittoa Country of that time, and went to the Boreas Greyrat House.
While teaching magic to Eris Boreas Greyrat (Later Mad Sword King Eris), he also commenced his work on creating dolls using Earth Magic.
Although he had talent not befitting that of a child, when his parents didn’t show up on his 10th birthday, he still shed tears, acting more suitable for his age.
In K417, the Teleport Incident happened, and along with Eris, he was teleported to the Bingoya Region of the Demon Continent.
There, he made Ruijerd Supardia his ally. Ruijerd was feared as 『Dead End』 at that time and after becoming an adventurer, he started his journey from the Demon Continent to the Central Continent to reach the Fittoa Country.
During that time, he met Zanoba Shirone and Cliff Grimoire who would later become his allies.
When he turned 13, after escorting Eris to the Fittoa Country, he journeyed to the Northern part of the Central Continent in order to find his missing family. From there, he became well-known by the name『Rudeus of the Quagmire』.