Possibly Robert Liddell (previously called Sir Richard Myddelton, 3rd Bt) by Sir Ralph Cole, 2nd Bt (Brancepeth c.1625-1704)
Previously attributed to Sir Godfrey Kneller as of Richard Myddelton 3rd Bt (1655 - 1716), circa 1685. A three-quarter-length portrait of a middle-aged man, standing, to right, in a wooded landscape. He is turned three-quarters to right, gazing at spectator, with a double chin, full-bottomed dark-brown wig, large white lace cravat, white shirt and wearing a brown coat and cuirass with a crimson cloak. He is leaning on a rock with his left elbow, his right hand on his hip. A landscape with trees and clouds can be seen in the background on the right. attributing it to Kneller, of whom there was a different portrayal in the family wing. This is most probably a portrait of the grandfather of Mary Liddell painted by his 1st cousin once removed (Another Mary Liddell was Sir Ralph Cole's mother). It is identical in pose, dress and setting to the only other surviving portraits identified as by the amateur painter of Brancepeth Castle, 'A Self Portrait' sold at Christie's in 1948 and a portrait of his father-in-law, Thomas Wyndham at Petworth Sussex.