What is this captain’s name please? It looks like Hames or Hanes, Hamer or Haner. Maybe even Horner?
It was painted in 1825 when he was in his 77th year, so born in 1748-1749 by my reckoning.
It says “Captain” and “R.N.” but he may have worked as a captain of a merchant vessel after serving with the Royal Navy in a more junior capacity (everything is possible).
Please note - this image is part of a picture listed for auction currently with Griffin’s Auctioneers and the images are theirs:
https://auctions.griffinsauctions.co.uk/catalogue/lot/0c80aa7ba7aa0538b41b1fd87f874fa3/bc09431f170ad976be15f1da4fefbdfd/antiques-interiors-collectables-lot-531/(@admin, I think this is ok isn’t it?)