Archaeologists may have found the grave of the legendary "fourth musketeer" - Ars Technica

Another intriguing mystery. Archeologists have unearthed what they believe to be the remains of musketeer D'Artgan

Whether it is him or not remains to be seen. But the signs certainly point to it being him.  

https://arstechnica.com/science/2026/03/archaeologists-may-have-found-the-grave-of-the-legendary-fourth-musketeer/