Robert Duval , also referred as Robertus Vallensis, was a French alchemist. In 1886, John Ferguson stated that the 'De veritate et antiquitate artis chemicae' by Duval stands out as 'the first history of chemistry. Wikipedia*
On the C-SPAN Networks:
Robert Duval has one video in the C-SPAN Video Library; the first appearance was a 2003 Forum.