Since he was brought up by TAIRA no Tomomori when he was small, he was an imitation Crown Prince and was taken to the western part of Japan (Chugoku, Shikoku, Kinki area) after the Taira clan escaped from the city.
幼い頃、平知盛に育てられていた関係で、平家が都落ちをした際に皇太子に擬されて、西国に連行される。