Rokeby Venus as well as classical sculptures known to Velázquez, of which casts were made for Madrid. These were the "Sleeping Ariadne" now in the Pitti Palace, but then in Rome, of which Velázquez ordered a cast for the Royal collection in 1650–51, and the Borghese Hermaphroditus, a sleeping hermaphrodite (picture to the right above), now in the Louvre, of which a cast was sent to Madrid, and which also emphasises the curve from hip to waist. However, the combination of elements in Velázquez's composition was original. The "Rokeby Venus" may have been intended as a pendant to a sixteenth-century Venetian painting
Matthew Montagu, 4th Baron Rokeby C F Greville. He married on 9 July 1785, Elizabeth (died 7 March 1817), daughter and heir of Francis Charlton of Kent, who bore him six sons and seven daughters: Matthew Montagu, 4th Baron Rokeby Matthew Montagu, 4th Baron Rokeby (23 November 1762 – Montagu House, Portman Square, 1 September 1831), FRS, 6th Bart., known as Matthew Robinson until 1776, was a British Member of Parliament, and briefly a baronet and Peer of the Realm. Montagu was born Matthew Robinson, the son of Morris Robinson of the Six Clerks' Office, Chancery Lane and nephew of Matthew Robinson, 2nd Baron Rokeby.