藩主は四十歳で隠居し、家督を嫡男に譲った。
The domain lord retired at forty and passed headship of the house to his eldest son.
旧民法では、戸主は隠居によって家督を譲ることができた。
Under the old Civil Code, a head of household could hand over headship of the family by retiring.
隠居した後も、先代は家の実権を握り続けた。
Even after handing over headship, the former head kept real control of the family.