Barthélémy Faujas de Saint-Fond (Montélimar, France, 1741–1819) is a renowned scientist whose work on volcanoes influenced the birth of volcanology. In the meantime, he developed a strong interest in the use of natural pozzolan which he recognised as a key ingredient of durable Roman mortars. Indeed, he recognised the similarity of pozzolans from Pozzuoli (the cradle of Roman pozzolan, which gave the name to this product) and newly discovered pozzolans from various places in France. Within 18th and 19th century renowned cement scientists, it is of interest to emphasise the work of Faujas de Saint-Fond. In the current trend to develop sustainable binders based on pozzolans and low-CO2 activators, his work on pozzolan-lime mixes is worth recalling today.