Vikings season 4

The fourth season of the historical drama television series Vikings premiered on February 18, 2016 on History in Canada. The series broadly follows the exploits of the legendary Viking chieftain Ragnar Lothbrok and his crew, and later those of his sons. The first season of the series begins at the start of the Viking Age, marked by the Lindisfarne raid in 793.

The fourth season consists of a double-season order of twenty episodes, split into two parts of ten episodes;  The first half concluded on April 21, 2016. The second half premiered on November 30, 2016. The season follows the battles between Ragnar and Rollo in Francia, Bjorn's raid into the Mediterranean, and the Viking invasion of England. It concluded in its entirety on February 1, 2017.

Main

 * Travis Fimmel as King Ragnar Lothbrok, the head of the Earldom of Kattegat who was crowned king after Horik's death
 * Katheryn Winnick as Queen Lagertha, a shield-maiden and Ragnar's ex-wife; she controls the Earldom of Hedeby calling herself Earl Ingstad. Later, she becomes queen of Kattegat.
 * Clive Standen as Duke Rollo, a warrior and Ragnar's brother; he was granted the title of Duke of Normandy by Emperor Charles.
 * Gustaf Skarsgård as Floki, a gifted shipbuilder and a friend of Ragnar's. He is on trial for the murder of Athelstan
 * Alexander Ludwig as Bjorn Ironside, Ragnar and Lagertha's son, who has a relationship with Torvi
 * Nathan O'Toole portrays a young Bjorn Ironside, appearing in Ragnar's visions.
 * Alyssa Sutherland as Queen Aslaug, Brynhildr's daughter and Ragnar's second wife
 * Ben Robson as Earl Kalf, a Viking warrior who shares the control of Hedeby with Lagertha (part 1)
 * Lothaire Bluteau as Emperor Charles of West Francia (part 1)
 * John Kavanagh as The Seer, the seiðrmann of Kattegat
 * Linus Roache as King Ecbert of Wessex, the ruthless king of Wessex
 * Peter Franzén as King Harald Finehair, a Viking ambitious to become the first King of Norway
 * Jasper Pääkkönen as Halfdan the Black, Harald's violent younger brother
 * Kevin Durand as Harbard, a charismatic wanderer and storyteller (part 1)
 * Alex Høgh as Ivar the Boneless, the fourth son of Ragnar and Aslaug (part 2, guest part 1)
 * James Quinn Markey portrays a young Ivar the Boneless
 * Marco Ilsø as Hvitserk, second son of Ragnar and Aslaug (part 2, guest part 1)
 * Stephen Rockett portrays a young Hvitserk
 * David Lindström as Sigurd Snake-in-the-Eye, third son of Ragnar and Aslaug (part 2, guest part 1)
 * Elijah O'Sullivan portrays a young Sigurd Snake-in-the-Eye
 * Jordan Patrick Smith as Ubbe, eldest son of Ragnar and Aslaug (part 2, guest part 1)
 * Luke Shanahan portrays a young Ubbe
 * Moe Dunford as Prince Aethelwulf, son of King Ecbert (part 2, recurring part 1)
 * Jonathan Rhys Meyers as Bishop Heahmund, a very religious warrior priest (part 2)

Recurring

 * George Blagden as Athelstan, a deceased Anglo-Saxon monk and friend of Ragnar's. He was killed by Floki towards the end of the previous season and appears in Ragnar and Ecbert's visions.
 * Dianne Doan as Yidu, Queen Aslaug's new slave
 * Maude Hirst as Helga, Floki's long-suffering lover and wife
 * Owen Roe as Count Odo of Paris
 * Edvin Endre as Erlendur, son of King Horik and second husband of Torvi
 * Georgia Hirst as Torvi, wife of Erlendur and, later, wife of Bjorn
 * Morgane Polanski as Princess Gisla of West Francia, daughter of Emperor Charles, wedded to Duke Rollo
 * Rosalie Connerty as Angrboda, daughter of Floki and Helga
 * Huw Parmenter as Roland, Count Odo's first-in-command and Therese's brother
 * Karen Hassan as Therese, Roland's sister and Count Odo's mistress
 * Amy Bailey as Queen Kwenthrith of Mercia
 * Jennie Jacques as Princess Judith of Northumbria, daughter of King Aelle, wedded to Aethelwulf
 * Seán T. Ó Meallaigh as Prudentius of Troyes, a monk serving at the court of King Ecbert
 * Des Carney as Waerferth the Scout, serving King Ecbert
 * Conor Ó Hanlon as infant Alfred, Princess Judith and Athelstan's son
 * Philip O'Sullivan as Bishop Edmund, serving at the court of King Ecbert
 * Niall Cusack as Abbot Lupus, serving at the court of Emperor Charles
 * Ivan Kaye as King Aelle of Northumbria
 * Ruby O'Leary as Gyda, Ragnar and Lagertha's daughter. She appears in Ragnar's visions.
 * Josefin Asplund as Astrid, Lagertha's lover and advisor
 * Ida Marie Nielsen as Margrethe, one of Queen Aslaug's slaves
 * Anton Giltrap as Guthrum, Jarl Borg and Torvi's son
 * Charles Last as William, first son of Rollo and Gisla
 * Isaac O'Sullivan as child Alfred, Princess Judith and Athelstan's son
 * André Eriksen as Odin, appearing in visions
 * Sinead Gormally as Tanaruz, a Moorish child
 * Charlie Kelly as Egil, an agent of King Harald
 * Cathy White as Queen Ealhswith of Northumbria, King Aelle's wife
 * Caitlin Scott as Princess Blaeja, daughter of King Aelle
 * Jack Nolan as Earl Jorgensen, a Swedish warlord
 * Sophie Vavasseur as Princess Ellisif, the object of King Harald's affections
 * Gary Buckley as Earl Vik, Princess Ellisif's husband
 * Gary Murphy as Bishop Unwan, serving at the court of King Aelle

Guest

 * Søren Pilmark as Stender, a farmer whose family was killed in Wessex. He was killed by Ragnar and appears in his dreams.
 * Steve Wall as Einar, a scheming troublemaker. He is killed by Lagertha.
 * Frankie McCafferty as Sinric, a polyglot drifter
 * Cillian O'Sullivan as Eirik, a Viking warrior in Paris, former second in command of Rollo. He is betrayed by him and killed by Franks.
 * Robban Follin as Berserker, an assassin recruited by Erlendur and Kalf to kill Bjorn. He is killed by Bjorn himself.
 * Declan Conlon as Lord Wigstan, Queen Kwenthrith's second cousin and the head of the Royal Family of Mercia
 * John Kavanagh as Pope Leo IV
 * Adam McNamara as Thorhall, a Danish Viking who delivers bad news to Queen Aslaug and Bjorn
 * Liam Clarke as Gudmund, a settler in Ragnar and Ivar's party
 * Ed Murphy as Gardar, a settler in Ragnar and Ivar's party
 * Jack Walsh as John Scotus Eriugena, a theologian
 * Cameron Hogan as Magnus, Queen Kwenthrith and King Ragnar's supposed son
 * Josh Donaldson as Hoskuld, a Viking warrior of great skill
 * Tamaryn Payne as Widow Ordlaf, a lady of Sherborne

Development
Vikings is an Irish-Canadian co-production presented by Metro-Goldwyn-Mayer. The fourth season was developed and produced by Octagon Films for the first sixteen episodes, TM Productions for the last four episodes, and Take 5 Productions. Morgan O'Sullivan, Sheila Hockin, Sherry Marsh, Alan Gasmer, James Flynn, John Weber, and Michael Hirst are credited as executive producers. This season was produced by Keith Thompson for the first eight and for the last four episodes, and Sanne Wohlenberg for the ninth to sixteenth episodes. Bill Goddard and Séamus McInerney are co-producers.

The production team for this season includes casting directors Frank and Nuala Moiselle, costume designer Joan Bergin, visual effects supervisor Dominic Remane, stunt action designers Franklin Henson and Richard Ryan, composer Trevor Morris, production designer Mark Geraghty, editors Aaron Marshall for the first, fourth, seventh, fifteenth and eighteenth episodes, Christopher Donaldson for the second, fifth and eighth episodes, Tad Seaborn for the third, sixth, ninth, eleventh, thirteenth, sixteenth and nineteenth episodes, and Don Cassidy for the tenth, twelfth, fourteenth, seventeenth and twentieth episodes, and cinematographers PJ Dillon for the first eight and last four episodes, and Owen McPolin for the ninth to sixteenth episodes.

Music
The musical score for the fourth season was composed by Trevor Morris in collaboration with Einar Selvik. The opening sequence is again accompanied by the song "If I Had a Heart" by Fever Ray.

The soundtrack album was released on December 27, 2019 by Sony Classical Records. An additional original song not included in the album is "Snake Pit Poetry", written by Einar Selvik and performed by Hilda Örvarsdóttir, and featured in "All His Angels". The track was released as a single on October 20, 2017, together with a second version solely performed by Selvik.

Additional non-original music by Norwegian music group Wardruna is featured in the episodes "In the Uncertain Hour Before the Morning" and "Crossings". The featured tracks are "Bjarkan", "Laukr" and "Algir — Tognatale".

Critical response
Both parts of the fourth season of Vikings received very positive reviews. The review aggregator website Rotten Tomatoes reported a 92% approval rating, with an average rating of 8.3/10 based on twelve reviews. The critical consensus reads: "Vikings returns for another season of fantastic performances, epic battles, and sharp writing sure to please its barbarous hordes of fans."