I'm reading this historical royal novel. I appreciate authors who do a lot of research for those. But I get irritated when the author seems to feel the need to "show off" their research. This one actually had a glossary of terms at the back--different parts of clothing and armor, household equipment, food, etc.. There's a fine line between "details that add atmosphere" and "details that confuse and distract the reader for no good reason, except the author read them somewhere and wanted to use them."
In a similar vein, these people had big families, and they pulled from a limited pool of names, and they all intermarried, and they had different titles. That is all true. But it's not necessary to mention every single kid born to every single couple, and extraneously work them into scenes, just because you know the kid existed. I'm 80% of the way through the book and at this point I can't remember whose kid is whose, who is whose brother, etc.. Or how old they're supposed to be, because the book covers something like 30 years and jumps around in time a lot. I'm like, "Wait, isn't he supposed to be the mentor to him? But he's still a kid himself? Crud monkeys, how much longer is this book going to go on?"