His territory changed to Sakura Domain in Shimousa Province with additional properties in 1602, and at the same time his adulthood was formally recognized and he identified himself as Kazusa no suke (Assistant Governor of Kazusa Province) Tadateru.
慶長7年（1602年）に下総国佐倉藩5万石に加増移封され、元服して上総介忠輝を名乗る。