Jessamine Gratianus was a Red Church acolyte from Mia Corvere's crop who failed to become a Blade. She was the daughter of Marcinus, an Itreyan centurion who was crucified for his loyalty to Mia's father, Darius Corvere. Jess blamed Darius, and by extension, Mia herself, for her father's death- though, in truth, the girls had much in common. For example, their joint desire to see their fathers' deaths avenged.
Jessamine, however, would not live long enough to see Mia's vengeance. She was killed by Ashlinn Järnheim in a duel she had every reason to win, save for the distraction of a less vicious companion, namely, Mia Corvere.