Southall's painting 'Sigismonda' (Birmingham Art Gallery) was exhibited at the New Gallery, London, in the summer of 1898. It was also included in the 1980 exhibition catalogue, pp. 33-34, no. B2 (illustrated).
The painting shows the heroine drinking poison after her father has killed her lover, Guïscardo, and sent her his heart in a goblet. The story was the subject of a well-known painting by William Hogarth (Tate Britain).