Louis VIII
The sons of Louis VIII and Blanche of Castile used golden castles on a red background (derived from the arms of Castile) as charges to difference their arms: for Robert, a "label"; for Alphonse, a semy of castles; for Charles, a "bordure". This initial system of differencing was dropped in favor of a longer-lasting simpler system. Charles, the youngest son of Louis VIII, changed his arms in favor of the arms of France with a plain "label gules".