Princess Taiyin was ruler of the planet Mazam in the 26th century. When her world was conquered by the Daleks, she agreed to surrender all weapons in order to save her people. When this was done, the Daleks decided to exterminate her as she was no longer of use to them. Before they could do so, Abslom Daak materialised in the room and killed the two Daleks present. Together they escaped from the palace and attacked the Dalek base nearby. Taiyin and Daak fell in love with each other. The pair planned to run away to a peaceful planet, but (COMIC: Abslom Daak... Dalek Killer)
The pair knew each other for less than a day, but Daak would spend decades idolising her memory. (COMIC: Physician, Heal Thyself)
Daak kept Taiyin's body in a cryogenic unit, hoping to someday find a medic capable of reviving her. (COMIC: Star Tigers, The Then and the Now)
Behind the scenes
While many early issues to feature Abslom Daak would treat his fixation on Taiyin as a romantic disposition that drives his hatred for Daleks, many stories written decades later would treat his feelings for Taiyin as an obsession. Several times, writers would attempt to illustrate Daak "moving on" and even burying the body of Taiyin.
In interviews with altered vistas, Steve Moore (the writer of many of the early appearances of Daak and Taiyin) stated that he had not been happy with how later issues of DWM had used each character.
...generally it seems to me that later editors and authors have overlooked the extreme importance of Taiyin to the story, especially now that she’s dead. Without her, Daak is just a thug with a chainsaw; with her, he’s a tragic figure who has real depth of character. Unfortunately it seems that most other writers and editors just want the thug with the chainsaw, which just doesn’t go anywhere and certainly doesn’t fit with the more idiosyncratic world of the regular Doctor Who stories, so it’s hardly surprising Daak’s become a figure of fun in later appearances.
Moore died before the publication of Doctor Who: The Eleventh Doctor Year 2, which more closely stuck to the "basics" of their relationship.
