In 2021, the southwestern French city of Bayonne, Pyrénées-Atlantiques, announced that it had accepted on behalf of its fine art museum Musée Bonnat-Helleu a donation by William Samuel Horton’s granddaughter, Mrs Carlotta Edwina Gray Hadley. This donation would include 31 paintings or drawings, out of which 16 oil paintings by William Samuel Horton and 3 by Edward Le Bas, W. S. Horton’s son brother in law. These works are mostly landscapes. In 2020 Mrs Carlotta Edwina Gray Hadley had already made a first donation to the Musée Bonnat-Helleu of Bayonne, of 13 books containing 469 drawings and sketches made by William Samuel Horton during his travels in Europe.
