Until 1947, when former Imperial families renounced their status, there had been many Miyakes and a custom to call the prince who was an heir to his father who was to succeed the Miyake, 'Wakamiya'.
1947年（昭和22年）に旧皇族が皇籍離脱する前までは宮家の数が多く、父宮の嗣子として宮家を継ぐべき王子をこのように称する慣習があった。