In March 845 Viking Danish-Swedish King Ragnar brought 120 ships up the Seine river for the Siege of Paris.

The Vikings left Paris after a month of battle when Frankish King Charles the Bald paid them 7,000 lbs of silver and gold.

[2] Across the 16th century, French mercenaries such as Claude Collart and Pontus de La Gardie entered Swedish service.

In 1570, France, along with Poland and the Holy Roman Empire, helped conclude the peace between Sweden and Denmark at Szczecin ending the Northern Seven Years' War in 1570.

The next year, French Marshal Jean-Baptiste Jules Bernadotte, who served under Emperor Napoleon, was elected as the heir-presumptive to King Charles XIII of Sweden, who was childless.

The Danish king ceded Norway shortly after the demands out of fear of Sweden declaring war on Denmark.

[5] After this he became Charles XIV John of Sweden, and simultaneously founded the House of Bernadotte from which the current Swedish royal family hails from.

[2] Military cooperation between France and Sweden is modest as the Swedish focus on exchanges with their Nordic neighbors.

[9] French foreign direct investment (FDI) in Sweden totalled €3.3 billion in 2013, primarily in the agrifood, equipment and electrical goods sectors.