Euris Bassianus was the daughter of Marius Bassianus. Euris was a vanship navi. She and her fiancee Alex Row were charged with the mission of carrying a peace treaty between the warring nations of Anatoray and Disith. However, as they attempted to cross the Grand Stream, they were intercepted by the Maestro Delphine and Exile. Euris died, and the treaty was lost. Alex Row never forgave the Maestro for Euris's death. His overpowering desire for revenge led him to become captain of the Silvana, track down the four Mysteria, and launch a rebellion against the Guild.