Gaius, then named Arst, was born in the small Outway tribe, which was under the control of the larger Long Dau tribe. His father was the tribe patriarch, and though he was weak and sickly, he was both strict and sensible, which made him a good chief. At the time, social division was strong due to the tribe system. The country was ruled by a king, Merad Sarakhs , and big influential tribes such as the Long Dau tribe or the Kitarl tribe. The other, smaller tribes had little power of their own and conflict was common. 
Arst is unofficially the youngest person to have won in the coliseum, as he was 12 when he accomplished that feat, without even using a Lilium Orb. However, as his opponent in the finals was the son of a tribe chief who was close to the king, his victory was never officially recognized. 
His little sister, Karla, was engaged to an older man of the Long Dau tribe who was close to the Long Dau patriarch and his son. 
In Trames 2273, Milan Fenn, king of the country of Rashugal, fell ill and died without naming a successor, prompting his two eldest sons to start fighting for the throne. King Merad seized the occasion to invade Rashugal, and both armies clashed in the Fezebel Outback. 
Arst joined the Long Dau tribe’s ranks instead of his father, who was too frail to fight a war, and brought the Outway soldiers to the Long Dau capital before they all departed to the battlefield . The Long Dau leaders underestimated him because of his young age and did not hold any expectations for him , but he proved to be an excellent soldier and leader, and his unit took out one of the Rashugal army’s regiments. Arst was one of the first who sensed the giant tsunami coming, and he tried to warn the Long Dau chief, Lars Long Dau, so that they could retreat to safety. However, his sister’s fiancé convinced Chief Lars to keep fighting and Arst’s warning was ignored. As a result, a large part of both armies, among which most of the Outway men, were swept away by the tsunami. This put a halt to the war. 
Karla’s fiancé survived the tsunami but never came back from the war. Arst is rumored to have murdered him, but the truth will forever remain unknown. 
The disaster left Arst bitter. He was angry with the current tribe system, which allowed incompetent people to become rulers just because they were born in the right tribe. He started to develop a vision of Auj Oule where the country would be unified under one single strong leader who would take care of every citizen and not sacrifice the weak. 
After his father died of illness, Arst left his home and formed an organization called Taurus, independent from the tribe system, which would carry his ideals. He changed his name to Gaius, which means “he who pulls the world behind him," and severed his ties with his sister so that she would not be harmed because of him. He was quite popular amongst his followers, who started to call him “The Dawn King." The first known feat of his revolution, a little before the creation of Taurus, was his victory against Lars Long Dau in Trames 2276.  When he started rebelling against them, Lars Long Dau took a few men with him to subdue him, but greatly underestimated Gaius and lost the battle. His death earned Gaius the tribe’s animosity. Taurus opposed the main tribes, and clashed with the Long Dau, which were determined to avenge its leader, on several occasions. 
In Trames 2278, Taurus and the Long Dau tribe, led by its young new leader Līn, clashed one last time in the Battle of Mon Highlands. Like during the Fezebel War, Gaius foresaw a natural disaster coming: he deduced that if both armies were to clash there, they would cause an avalanche that would likely engulf them both. Trying to prevent another catastrophe, he went to meet Līn in person to warn him about the incoming danger. When asked why he had not simply taken advantage of the avalanche to wipe out his enemy, he replied that those soldiers would one day be precious warriors who would support his country and help him forge a new path for the good of his people, and he did not want them to lose their lives meaninglessly. Gaius left a profound impression on the young chief, who took his warning seriously and had his troops retreat. The avalanche happened without causing many victims. The next day, Līn surrendered to him and later became his right-hand man and most trusted ally – Wingul. 
In Trames 2283, Gaius and his ever-growing army finally seized Kanbalar, which was no easy feat, as the city has the best natural defenses in all Rieze Maxia. He proclaimed himself king of Auj Oule, but Merad managed to escape and tried to strike back with help from Rashugal. However, Gaius defeated him once and for all in the Battle of Arklund. 
Taurus was dismantled once Gaius became king, but most of its members got high ranks in the new Auj Oule army. 
Gaius introduced a lot of reforms, such as the banning of fights to the death in the coliseum. The big tribes lost their power and he united the whole of Auj Oule under him. While Merad had ruled as a tyrant, Gaius cares about his people and listens to their demands. He spends a large part of his days meeting the people in his castle, and if important matters arise, he often goes and sees for himself. This makes him a well-loved and respected ruler of his country, and his popularity even spreads to Rashugal.
Over the years, Gaius found other people to serve as his personal bodyguards. They took on the name “Chimeriad” when their group was completed after the Battle of Shrade Island in Trames 2291, where the five of them wiped out a company of 120 Rashugal men who Nachtigal had sent to invade the island 
The name “Chimeriad” comes from the legend of the birth of Auj Oule – it is said that the Chimera was a giant monster that Kresnik the Sage fought in ancient times. According to the legend, Kresnik cut the Chimera into pieces with her lance, and the pieces formed the country of Auj Oule. The four members of the Chimeriad are all named after a body part of the monster. 
When Gaius learned about the existence of the Lance of Kresnik, he decided to take control of it, not because he wanted power, but because he believed that such a powerful weapon could only be wielded right in the hands of someone strong enough to assume the responsibilities that came with it. He believed that his keeping it would prevent further wars, because it would act as a repellent, but he had no intention of using it himself. 
He clashed with Milla Maxwell over this matter, because she believed that the Lance should be destroyed – even if Gaius proved strong enough to not succumb to the temptation of using it, he would not be around eternally to watch over it. He realized that he had not considered the long term seriously enough, and he found new resolve as to what his role as king meant. The answer he gave Milla was that the strong ones must support and guide the weak until they become strong in turn. He believes that the strong ones have a duty to move the world forward. He and Milla were very similar on many points, but their disagreement over what to do with the Lance lead them to fight each other during the Battle of Fezebel, which opposed Auj Oule and Rashugal once again in the Fezebel Marsh.
But once the Lance was fired and soldiers from Elympios invaded Rieze Maxia, he chose to save her, and they joined forces to reclaim Kanbalar and fight Gilland. They were still in disagreement over certain issues, but they recognized each other’s value. After her death, Gaius commented that never before had a woman had such a strong impact on him as Milla.
Gaius had always seen Jude as one of the weak, admiring the strong ones (Milla, in this case), but never dreaming of becoming one himself. However, the Jude he met again after Milla’s sacrifice was different. He had found his own resolve, and had become one of the strong ones. Milla and Jude were live examples of his ideal.
However, new divergences of opinion lead them to oppose each other once more. Faced with the threat of spyrixes, Gaius chose to save Rieze Maxia first, even if it meant leaving Elympios to its fate. For that, he, with the help of Muzét, imprisoned Maxwell within the Lance of Kresnik to keep the schism intact, and went to Elympios, where he decided to destroy spyrixes, starting at the source, the spyrix research facility at Helioborg. While Muzét wanted to destroy each and every spyrix, he decided to start with military ones at first, and realized that he would need to consider what to do in the case of spyrixes such as medical ones that improve weak people's lives. 
Milla and Jude, on the other hand, realized how important spyrixes were to the people of Elympios, and decided to find a way for them to keep them without endangering spirits or Rieze Maxians. That led to the discovery of spyrites, spyrixes that did not kill spirits. But a lot of research was needed to even hope that spyrites could work, and Gaius thought that there was not enough time for that. A final confrontation was unavoidable.
Gaius eventually lost his fight against them, and decided to believe in Jude and see what kind of future he would bring to the world. Milla releasing the schism and becoming the new Maxwell would give them enough time to find a solution to the spyrix problem.
With King Nachtigal’s death, Rashugal was in chaos. The threat posed by Exodus had given both countries a common cause, which enabled Gaius, with help from Rowen, to unite both countries. By treating the people of Rashugal not as defeated enemies, but as equal people of Rieze Maxia, he quickly earned their trust and respect. After the events of the game and the release of the schism, he started working with Rowen and Elympios’ Prime Minister Marcia to forge peace and understanding between the two worlds.