Le rêve de la lance - serpent

The mix of real history and fantasy created a vivid world, but I'm curious how much was planned versus evolved during writing. Did the historical research influence the fantasy aspects?

The characters’ internal struggles felt very real and layered, which made the story stand out for me. Was this a deliberate focus from the start or did it develop organically?

The setting added so much depth and atmosphere, but I wonder what drew the author to this era specifically. Was it personal interest, research, or a narrative decision?