The portrait depicts Mrs Rhoda Delaval, née Apreece (d. 1759), then wife of Captain Francis Blake Delaval, wearing a fashionable ‘Van Dyck’ costume popular in society portraits and the ritual of the masquerade. It would appear to be a copy of an identical portrait in the collection at Seaton Delaval,¹ which has been attributed on stylistic grounds to Enoch Seeman the Younger (c.1694–1744). Given the technical superiority of the version at Seaton, and the existence of other replicas in the two collections, it is possible that DN58 is a copy made by Mrs Delaval’s daughter Rhoda Delaval (1725–1759). If that is the case, the present version would then probably date from the 1740s.