He was born as the son of Imperial Prince Tokiwainomiya Mataakira, who was the 5th head, and in December 1512, he was given the title of Imperial Prince ("Sanetaka ko ki" - the journal of Sanetaka SANJONISHI).
5代当主・常盤井宮全明親王の子として生まれ、永正9年（1512年）11月に親王宣下される（『実隆公記』）。