Larian Studios Forums Baldur's Gate III Baldur's Gate III - Story & Character Discussion The insane timeline of the main plot (do I even need to tell you that it's spoilers?)

that was the year when Ketheric was ressurected. In truth, the Soul Cage could have been employed any time between 1482 and 1492, but I think it is safe to assume 1482. The game canonically takes place in 1492, and when you visit Aylin, she remarks that it has been a century since she's been stuck in there, therefore we can conclude that she was imprisoned by Ketheric at latest in 1392 - sometime after Isobel's death. It wouldn't be until at least 90 years that the Soul Cage is employed.