Unidentified

There are two long narrow pieces at St James's cited in van der Doort's Titian list (WS 184), this is clearly one of them. 

Van der Doort c.1639

Titian

Venus in a Landscape

Walpole Society reference (1960): 
WS 228, № 50
Room description extended: 
The Gallery
Original Manuscript page number: 
V. & A. MS., f. 111
Charles II inventory c1666: 
Whitehall, no 469, 107 x 157 (possibly)
Identification certainty: 
Unidentified
Sale Inventory c.1649-51

(said to be Titian)