Shirayukihime was the daughter of the previous incarnations of Kisuke Urahara and Yoruichi Shihoin. When she was a child, Kisuke’s past incarnation sold her to the Emperor of Heaven, the ancestor of the modern Soul King.
She was in love with Zangetsu, the princes’ teacher. Price Kail, the second prince was in love with her and hoped she would become his wife.
The Emperor ordered her to marry his eldest, Crown Prince Ichigo, his heir who would become the next emperor. Shirayukihime remained faithful to her husband.
Ichigo loved Shirahime but loved the guard Rukia more. He abandoned Shirayukihime for Rukia and never knew she was pregnant with their first and only child, Princess Hikari.
Shirayukihime died from blood loss during a difficult childbirth.
Known Previous Incarnations
Shirayukihime did not die immediately after childbirth. She left to fight many enemies, but the blood loss during childbirth eventually killed her.
Ichigo Kurosaki and others discover that Crown Prince Ichigo planned to poison Shirayukihime to kill her off so he could be with Rukia, Rukia Kuchiki’s previous incarnation.
Ichigo Kurosaki discovers this in The Reincarnation and Toshiro Hitsugaya, Kenpachi Zaraki, and a few others find out later. Toshiro reveals this information in front of the taichos present at the meeting in the beginning of Fifth Division in the Red II: Princess Division. Chojiro Sasakibe and Momo Hinamori were also present at the meeting.