Kiyomori saw this as an opportunity and gave 9-year-old Seishi away in marriage to 22-year-old Motozane, who was the successor of the Sekkan-ke, on May 9 ("Gukansho" (Jottings of a Fool)).
清盛はこの機を捉え、4月10日、後継者で22歳の基実に9歳の盛子を嫁がせる（『愚管抄』）。