Gertrude Sadler was the wife of Sir Walter Aston, Lord Forfar, who was appointed
as James I's ambassador to Spain in 1620. Two versions of this portrait are known
to exist (the other is in the National Gallery of South Australia). It is possible that both versions were produced when Sir Walter was appointed an ambassador. However, it is not always possible to be certain
of the identity of the person shown in
a portrait, and it may be that the woman shown here is another Lady Aston: Magdalena, wife of Sir Thomas Aston
of Aston Hall, in Cheshire.