Henri August Duval (1777-1814) was born in Alençon, France. He was a physician, and lived a period shortly after when Cape plants were in vogue (roughly 1680-1772). He maintained a small garden that contained many succulent plants from South Africa. Very little is known of Duval himself, but the genus Duvalia was named after him, in appreciation and reciprocation by Haworth.
In 1809, Duval published a list of his plants in a pamphlet Plantae Succulentae, in Horto Alenconio. He raised Haworth’s Aloe section Parviflorae to a new genus, as Haworthia. A copy of his pamphlet was sent to Haworth in time for inclusion of the genus in his Synopsis plantarum succulentarum.