Okay this is good: He is obviously referring to when Lucy discovered Narnia. However, they ruled in Narnia for long enough to grow up, at least twenty years, then they came back to England for another year: AND THAT WAS THE LAST TIME HE DIDN'T BELIEVER HER! For a lifetime, and then some, he has trusted his little sister, even when it seems crazy.
Prince Pietro, the shy and kind one. He never raises his voice at anyone, not even a bee. He is sweet and soft, and is always willing to help others. You can find him playing with their little sister, Marina.