. Intaglio engraved with an elder victory Dark green chrysoprase 18th century gold setting engraved: "This ring was worn by John Churchill Marlborough at the battle of Blenheim, 2nd [...] 1704". Size (intaglio): 1 x 0.7 cm Former collection of John Churchill Duke of Marlborough (1650/1722) Gross weight : 4.10g Commander John Churchill Duke of Marlborough (1650/1722) was the commander of the English army, allied to Prince Eugène of Savoie against King Louis XIV at the Battle of Blenheim, which took place on on 13 August 1704 during the War of the Spanish Succession.