This takes place inbetween each book/season of Viking to keep up with all that goes on in Runa's life through the years (disclaimer: You don't have to read it but you will be confused as to how some events came about if you don't)

Runa Ivarrsdöttir. Runa Flokisdöttir. Runa Stubbornsoul. Princess. Orphan. Shieldmaiden.Wife. Mother. Queen. Legend. (Book 1/4; S1-3)