Tadahide was appointed to the Kanpaku (chief adviser to the Emperor) on January 31, 1609, and Sadako became Jusanmi Kita no Mandokoro (the legal wife of a regent or chief adviser to the Emperor).
慶長13年（1608年）12月26日、忠栄が関白に任官し、完子は従三位北政所となる。