Caius Maximus is the Marquis of the Maximus Estate in Sparta, Imperium. He was born to the late Carvilia Maximus and Kaeso Maximus.
At the tender age of 18, Caius left his home to pursue fantasies of becoming an Adventurer. During his travels, he partnered up with a small guild in Flatinca, Gadencia and became a member of the White Wolves.
Receiving his Class-C license at the age of 22, he moved from Gadencia back to Imperium where he began to train under Proclus Asinius Poplicola, an Elite Spartan who taught Caius how to reach a state known as the Awakening.
Then, in a span of seven years, Caius rose up to the coveted Class-A license alongside his lover-turned-wife from his time in the White Wolves, Aurelia Hermina. Together, they took on a mission to subjugate an Ancient Black Dragon alongside a party of several A-Ranks and three S-Ranks.
Arriving at the site, his party was immediately split off and individually taken down. Numerous monsters that the Association didn't count for arose from their slumber, including several Harpies and Wyrms who launched bombardment attacks from the sky. Meanwhile, slithering through the underground was the Ancient Black Dragon known as Zavorruss, picking off stragglers and bringing them back to his lair, where their bodies would be used to fuel his necromatic energies.
Eventually, Aurelia was pierced by a falling boulder as she pushed Caius away from the debris, knocking him into the dragon's lair and directly in front of Zavorruss. The two fought for nearly five minutes, which toward the latter half Caius managed to pierce the crystal (which had been harvested from a Association Building that Ur was unaware of) and cut off the dragon's ties to the Cycle of Rebirth.
After a prolonged fight, Caius was given an emergency boon by his Contractor, allowing him to put down Zavorruss for good. As a show of good-will, and with Zavorruss's last breath, he revealed to the Adventurer that his wife was pregnant, and using the last of his necromatic energies, sacrificed his remaining life to prevent the boy from dying.
This boy would later go on to be named Solitude Maximus, and the King of Imperium, Homerus Aristophanes, would recognize Caius's sacrifices, and through a unanimous vote of the council, elected his house to become next-in-line to the Throne of Imperium.