Giselbert of Luxembourg, born in the year one thousand and seven, was a prominent aristocrat who played a significant role in the governance of the region during the eleventh century. Initially serving as Count of Salm and Longwy, he ascended to the title of Count of Luxembourg following the death of his brother, Henry II, in the year one thousand and fifty. This transition not only expanded his influence but also provided him with the means to support the abbeys of Saint-Maximin in Trier and Saint-Willibrord in Echternach.
His tenure was marked by a notable dispute with the Archbishop of Trier, Poppon, regarding the abbey of Saint-Maximin. This conflict was eventually resolved through arbitration by his brother, Adalbero III, who served as the bishop of Metz. Giselbert's leadership was characterized by his commitment to the growth and fortification of Luxembourg City, which he expanded in the year one thousand and fifty, constructing a new fortified wall to accommodate the increasing population.
Giselbert's legacy extended beyond his political achievements; he fathered several notable children through an unknown wife. His lineage included Conrad I, who would later become Count of Luxembourg, and Hermann of Salm, the founder of the House of Salm. Additionally, he had daughters who formed alliances through marriage, further strengthening the family's influence. His son Adalbéron served as a canon at Metz, while another son, Rudolph, became the abbot of Altmünster Abbey.