Thyra is the daughter of Earl Ragnar. Sven kidnapped Thyra and stripped her half-naked before a young Uhtred saved her from being sexually assaulted. Upon learning of this, her father, Earl Ragnar crushed one of Sven's eyes as "half the punishment", then banished both Sven and his father Kjartan from his lands. Following this, Kjartan, with his grown-up son Sven, lead an assault on the estate of Earl Ragnar on the night of his daughter's wedding. Kjartan and Sven massacred most of Earl Ragnar's household, with the exception of Thyra, who was brought into their captivity.