A capriccio Welsh landscape with figures outside a castle

Attributed to Robert Adam (Kirkcaldy 1728-1792 London) A capriccio Welsh landscape with figures outside a castle with inscription 'A View in Wales./ P. Sandby fecit' (verso) pencil, pen and brown ink, grey and blue wash on paper 12 ½ x 20 3/8 in. (31.8 x 51.7 cm.)