Gertrude of Flanders, Duchess of Lorraine
Gertrude of Flanders (c. 1070–1117[1]), was a Countess of Louvain and Landgravine of Brabant by marriage to Henry III, Count of Leuven, and a Duchess of Lorraine by marriage to Theodoric II, Duke of Lorraine.[2] At the time the duchy was the upper Lorraine, since 959 separated from the duchy of Lower Lorraine.