Ida Nielsen – Margrethe
Ida Nielsen is a Danish actress that is best known for her role on Vikings.
Although, before the show, she also appeared on A Viking Saga: Son of Thor, her first film, and Anna Pihl.
Jessalyn Gilsig - Siggy Haraldson
Jessalyn Gilsig is a Canadian-American actress known for her many roles in television series that include Boston Public, Nip/Tuck, Glee, and of course, Vikings.
The actress began her acting career in a voice work part for a National Film Board of Canada production, Masquerade, at the young age of 12.
Ida Nielsen - Margrethe
Margrethe is known as the former slave residing in Kattegat that turned into a free woman. During her years as a slave, she was shared by all four sons of Ragnar and Aslaug.
Though she became a lover to each of them, she ultimately became the wife of Ubbe, son of Ragnar, who is responsible for freeing her from slavery.
Georgia Hirst - Torvi
Torvi is a Shield-maiden, princess, and the ex-wife of Jari Borg. After her husband’s death, Torvi ends up marrying the abusive Erlendur.
Erlendur is also eventually murdered by Torvi herself and runs away to live in Kattegat with Bjorn, the firstborn son of Ragnar.
Georgia Hirst - Torvi
Georgia Hirst is actually the younger sister of Maude Hirst, who played Helga on the show. She’s best known for her role on Vikings, which by the way, was her first break out role! She’s most recently done some work on the film Ravers.
Other than that, the actress hasn’t appeared much in major films or shows.