Walloon immigration to Sweden
The history of Walloon immigration to Sweden begins with industrialists Guillaume de Bèche (Willem de Besche; 1573–1629) and Louis De Geer (1587–1652), known as "the father of the Swedish steel industry". Five to ten thousand Walloons emigrated to Sweden, mainly working in the steel industry.
Source: Wikipedia — Walloon immigration to Sweden (CC BY-SA 4.0)