Princess Celestia, Princess of the Sun went missing thirteen years ago. Princess Luna searched for her beloved Tia, but not a trace could be found. There were no footsteps near her bed, the guards had seen nothing, and the bed was found nicely made, but empty. The breakfast hall had been empty, except for a bowl of oatmeal.

They assumed she had gone to a meeting or a royal something in a hurry, but one week later she was still no where to be found. Princess Cadence sent word she hadn't seen her either.

Within a year, they decided she was dead, and made her her grave.