The 13th Warrior

The 13th Warrior is a 1999 American historical fiction action film based on the novel Eaters of the Dead by Michael Crichton and is a loose retelling of the tale of Beowulf. It stars Antonio Banderas as Ahmad ibn Fadlan, Diane Venora and Omar Sharif. It was directed by John McTiernan. Crichton directed some reshoots uncredited. The film was produced by McTiernan, Crichton, and Ned Dowd, with Andrew G. Vajna and Ethan Dubrow as executive producers.

Ahmad ibn Fadlan is a court poet to the Caliph of Baghdad, until his amorous encounter with the wife of an influential noble gets him exiled as an ambassador to Northern Barbarians. Traveling with Melchisidek, his caravan is saved from Turkic raiders by the appearance of Norsemen presumably Varangian. Taking refuge at their settlement on the Volga river, communications are established through Melchisidek and Herger, a Norseman who speaks Latin. Ahmad and Melchisidek are in time to witness a fight, which establishes Buliwyf as heir apparent, followed by the Viking funeral of their dead king, cremated together with a young woman who agreed to accompany him to Valhalla.A youth enters the camp requesting Buliwyfs aid his fathers kingdom in the far north is under attack from an ancient evil so frightening that even the bravest warriors dare not name it. The angel of death, a vlva wisewoman, determines the mission will be successful if thirteen warriors go to face this dangerbut the thirteenth must not be a Norseman. Ahmad is recruited against his will. ........

Source: Wikipedia