All my older sisters ever wanted was power. Cassia was just a pawn, and they tried to make me one too. But I refused. That was why they hated me.
Our mother was Queen Swanwhite. She reigned for a little over 50 years before she died, peacefully of old age. Aslan himself attended our coronation. My sisters – Laerana the Fearless, Sabina the Merciful, and Cassia the Pure – and I felt honored. But that quickly died down. He gave each of us a little diamond vial, each containing just a drop of a blue liquid.
"Narnia will need you for much longer than your natural lives. This is a special cordial. Drink a drop a day. It will inhibit your growing older for one day. The next morning, the vial will refill itself. Keep this, and drink a drop each day until four rulers arise to take your place."
We let ourselves age to the respective ages of 17, 16, 14, and 12, then stopped aging. Narnia was in peace for 150 years, and then she came.