A small party of Vikings stays behind to maintain a presence in Frankia . Emperor Charles offers Rollo land, the title of Duke, and the hand of his daughter, Princess Gisla, in exchange for his loyalty and defense of Paris against future raids . "Vikings" The Dead (TV Episode 2015) - IMDb
While sailing home, Ragnar finally reveals to Floki that he knows Floki was the one who murdered Athelstan .
Severely wounded and weakened by the siege, Ragnar requests a Christian baptism and burial within Paris . After he seemingly dies, the Franks allow his body to be brought into the city's cathedral for a funeral mass .
The Season 3 finale of Vikings , titled features Ragnar Lothbrok executing a daring "Trojan Horse" ruse to finally conquer the seemingly impenetrable city of Paris . Plot Summary
During the service, Ragnar leaps from his boat-shaped coffin, kills the Bishop, and takes Princess Gisla hostage . He forces the guards to open the city gates, allowing his warriors to swarm in and sack Paris .