The Cross of Lorraine (Croix de Lorraine), known as the Cross of Anjou in the 16th century, is a heraldic two-barred cross, consisting of a vertical line crossed by two shorter horizontal bars. In most renditions, the horizontal bars are "graded" with the upper bar being the shorter, though variations with the bars of equal length are also seen. The Lorraine name has come to signify several cross variations, including the patriarchal cross with its bars near the top. The Cross of Lorraine came to the Duchy of Lorraine via the Kingdom of Hungary in the 15th century. Similar two-barred cross symbols prominently feature in heraldry from Poland, Lithuania and Belarus. Its ultimate origins are theorised to be Byzantine. The Cross of Lorraine was used as a symbol of Free France during World War II and was earlier used by French patriots to signify desire to reclaim provinces lost to Germany in the Franco-Prussian war.
The Cross of Lorraine consists of one vertical and two horizontal bars. In most renditions, the horizontal bars are "graded" with the upper bar being the shorter, though variations with the bars of equal length are also seen.
The Cross of Lorraine came from the Kingdom of Hungary to the Duchy of Lorraine. In Hungary, Béla III was the first monarch to use the two-barred cross as the symbol of royal power in the late 12th century. He probably adopted it from the Byzantine Empire, according to historian Pál Engel. René II, Duke of Lorraine inherited the two-barred cross as a symbol from his distant ancestors from the House of Anjou of Hungary, which had inherited it as kings of Hungary from the country's first ruling dynasty, the Árpáds. René's grandfather, René the Good, who used it as his personal sigil, laid claim to four kingdoms, including Hungary. The cross was still known as the "Cross of Anjou" in the . René II placed the symbol on his flag before the Battle of Nancy in January 1477. In the battle, René defeated the army of Charles the Bold, Duke of Burgundy, who had occupied the Duchy of Lorraine, and regained his duchy.