The Escorial added a loincloth and this feature to Benvenuto Cellini's life-size marble cross.
The British engraver William Marshall depicted one of these objects on Charles I in a print for the Eikon Basilike. In a painting by El Greco, the title figure is dressed in red and blue and wears (*) this object while looking up to the heavens. Two men use brown sticks as hammers in a painting of this object's creation by Caravaggio. A man in a black helmet peers out from behind a red robe in painting by Rubens of this object subtitled Ecce Homo. The Escorial added a loincloth and this feature to Benvenuto Cellini's life-size marble cross. For 10 points, name this object which was famously placed on Christ's head before the Crucifixion.
The British engraver William Marshall depicted one of these objects on Charles I in a print for the Eikon Basilike.
Crown of thorns