Gerberga of Boulogne (1025-1049) (1025–1049) Parents Matilda of Louvain Eustace I, Count of Boulogne Children Conrad I, Count of Luxembourg NN von Salm Siblings Lambert II, Count of Lens Geoffroy de Boulogne Eustace II, Count of Boulogne Baldwin I of Jerusalem John de Fiennes Partners Frederick, Duke of Lower Lorraine