Tailtiu makes her first appearance in Chapter 3 when she accompanies Claud to the Tower of Blaggi after Sigurd's army seizes Madino Castle. She does not reveal very much about her reasons are for doing so, apart from claiming to be Claud's bodyguard, to which the latter makes a failed attempt to deny.
After surviving the horrific Battle of Belhalla, Tailtiu and her young children, Arthur and Tine, spend a certain number of years hiding in Silesse. This false sense of security is quickly broken, however, when Bloom shows up there. While Arthur manages to evade capture, Tailtiu and Tine are forcefully separated from him and thereafter imprisoned by House Friege. Tailtiu then withstands years of abuse from her cruel sister-in-law Hilda to protect her daughter, eventually succumbing to depression and death.