The siege of Paris and the sack of Paris of 845 was the culmination of a Viking invasion of France. The Viking forces were led by a Norse chieftain named "Reginherus", or Ragnar, who traditionally has been identified with the legendary saga character Ragnar Lodbrok (Old Norse: "Ragnarr Loþbrók", contemporary Icelandic: "Ragnar Loðbrók"). Ragnar's fleet of 120 Viking ships, carrying thousands of men, entered the Seine in March and proceeded to sail up the river. The Frankish king Charles the Bald assembled a smaller army in response, but as the Vikings defeated one division, comprising half of the army, the remaining forces retreated. The Vikings reached Paris at the end of the month, during Easter. After plundering and occupying the city, the Vikings withdrew when they had been paid a ransom of 7,000 French livres [2,570 kilograms (83,000 ozt)] of silver and gold from Charles the Bald.