In 1588, he called himself Hidenobu SABURO and was appointed Jushijiju (Junior Fourth- Rank Chamberlain) after he moved to Gifu and had his genpuku at the age of 9.
天正16年（1588年）、9歳で岐阜市に入って元服し三郎秀信と名乗り、従四位侍従に任官した。