'Citizens and Kings' at Royal Academy [audio 7min]

A new exhibition looking at the radical changes in portraiture in response to both the Enlightenment and the revolutions in Europe and America, opens this week at London's Royal Academy. Focussing on the period 1760-1830, Citizens and Kings includes work by several interesting female artists. Presenter Martha Kearney talks to the RA's Senior Curator MaryAnne Stevens about the role of female portrait painters in this era, and the particular challenges they faced.