John Edwin Cussans,
The Grammar of Heraldry
(1866)
“ The Mantling is the ornamental accessory generally depicted behind the escutcheon. When the arms have supporters, it is usual to represent the mantling as a cloak (manteau) , or robe of estate. The royal mantling is of gold, and that of peers of crimson velvet; both being lined with ermine. The mantling of esquires is commonly depicted as hanging from the helmet ”
