Lyon Des Roys

Lyon Des Roys is known for La géométrie en vers techniques, a French work that presents geometry in poetic form rather than as a standard textbook. The book's unusual mix of mathematics and verse is the main reason his name has remained visible in library catalogs and digital archives.

Some sources identify him more fully as Lyon-François des Roys and place him in the late 18th and early 19th centuries, with dates given as 1768–1804. Because easily accessible sources are sparse and not all catalog-style records agree in the same level of detail, it is safest to say that he appears to have been a French author remembered chiefly for this distinctive educational work.

For modern listeners, the appeal is simple: Des Roys represents a wonderfully old-fashioned kind of literary experiment, where poetry was used as a practical tool for learning. Even if little else about his life is firmly documented here, that idea alone makes him memorable.