 His descendants of the Ardennes-Verdun dynasty ("Wigeriche") began to call themselves Counts of Luxembourg from the 11th century onwards.The House of Luxembourg, a cadet branch of the Dukes of Limburg, became one of the most important political forces of the 14th century, contending with the House of Habsburg for supremacy in Central Europe.The historic region of Luxembourg was settled by Celtic tribes in the 2nd Century.