Nine years ago.
Before embarking on the Lazarus Project, Eren received a confidential report from crown prince Rodrick Renar.
This report delved into the intricate details of House Lancelot's affiliations, key clan members, and its illustrious history that stretched back to the kingdom of Edinburgh's inception. Among the valuable information shared by Rodrick was knowledge about the Lancelot Guild and the City of Lancelot, two entities intricately connected to the house's present prosperity and substantial influence within the kingdom.
At that time, Eren's focus was primarily on House Lancelot's recent strengths and weaknesses, but the discovery of Shallot's Mirror being an Elder Seed Artifact piqued his curiosity about the clan's past heritage. To his surprise, information about Shallot herself was classified by the kingdom because of the fact that she was a Titan Slayer.