One day, while enjoying a trip in one of his kingdom's cities, the amnesiac king of Country X forgets the identity of his sole son and heir. Three men from the empire rush to send letters to the king--all claim to be of royal blood.
Father; do you remember the days we spent playing chess against each other? We spent entire afternoons with only each others' company honing each others' skills.
Your majesty; do you remember the speech we gave together at the city hall? You praised the younger me for having the courage to speak in public.
My liege; do you recall that day on late Mother's birthday, when I broke her favorite antique vase? To teach me a lesson, you made me clean the mess myself.
After inspecting all three letters, the king visits the royal library to read, as he often does. When he returns to his chambers that night, he quickly pens a letter to one of the claimants and has the other two arrested. Which person does he decide is the prince?