Lucius Orgueille was the oldest son and heir of the Orgueille house, a low rank noble house from the Beltram kingdom, until the fall of his house he was a candidate to the king's sword at the same time that Alfred Emal, after the fall of his house he began to work as an adventurer, at any moment after Ayame's murder he left the Bertram kingdom and founded the mercenary group the heavenly lion, also known as griffins, that will become famous through the Stralh region as a small group of elite warriors so legendary for its victories that every adventurer doing mercenary job would want to be allowed into it, in the last years, presumably because it's members, Lucius included,were lent to Reis by Lucius himself for having them doing secret jobs for him in different places it hasn't been heard at all about the mercenary group, it's been years already since the griffins stopped their official activities and a lot of people suspects that they disbanded but even like that even people unrelated to war like Liselotte knows of their fame.

(Source: Seirei Gensouki Wiki)