The pair grew up together, but Uhtred decided to support the Saxons, rather than the Danes who had raised him as a child.
In the latest season, Brida attempted to kill Uhtred as he had watched her get taken away as a slave for the Welsh King.
By the end of the season Brida, who had been in a relationship with antagonist Cnut (Magnus Bruun), had chosen never to trust men again.
Cox said: “Being with Cnut I think Brida struggles with, this man who’s not really her love, but who she’s decided for because she is in power with him and she’s safe with him, because she’s a leader if she’s with him.”
Speaking about how her character has evolved over the series, she said Brida had lost a lot of people in her life and she has come out stronger because of what she has had to face.