In 1624, he became a yushi (another's child considered as one's own) of Emperor Gomizunoo, then in 1626, he received the Imperial order for being an Imperial Prince and was named Tadahito.
寛永元年（1624年）後水尾天皇の猶子となり、寛永3年（1626年）12月親王宣下を受け、忠仁（ただひと）と命名される。