Tiliana Berthren

She is the daughter of the Duke of Berthren, an aristocrat from the Kingdom of Cherubim, a mid-sized nation in the Central Plains.

She was engaged to the first prince, Alfred, since childhood, but was unilaterally called off the engagement during the prince's birthday celebration.
She secretly made a love affair with Princess Corentine of Lauria, and the two of them went on the run, disguised as female knights under false names.