This autumn I have visited the Lavardens Castle which had an exhibition on D'Artagnan. Stole the English version of the explanations (QR codes, hosted incognito on their website)

https://pax.github.io/playground/lavardens-dartagnan/

Some Swedes will be delighted to learn that not only was there a historical d'Artagnan, but also a real life cardinal named Mazarin. But I have yet to find a historical person named Loranga.

https://en.wikipedia.org/wiki/Loranga,_Masarin_och_Dartanjan...

Same here. I thought it was completely fictional.

So, I immediately looked it up. There was a real d'Artagnan, he was kind of a big deal, so Dumas wrote some stories based on a fictionalized version of the real d'Artagnan.