She was considered a concubine when Shinkuro ISE was thought to have been a mere masterless samurai, but recent studies have almost confirmed that he was from the Ise clan, a distinguished family who was the head of the Muromachi shogunate's Administrative Board, and thus she has come to be considered a lawful wife.
伊勢新九郎が素浪人と考えられていた頃は側室とされていたが、近年の研究で室町幕府政所執事の名門伊勢氏の一族であることがほぼ明らかになっており、北川殿は正室だったと考えられてる。