In about 1471, Noritane succeeded as head of the clan because his father Suketane became a Buddhist priest (it is also said that he first claimed to be the head of the Chiba clan on this occasion).
孝胤は文明(日本)3年（1471年）ごろ父輔胤が出家したため家督を継く（このときに初めて千葉氏当主を自称したともされる）。