Sounds like you are talking about David Weber’s Safehold series which is very good. I have read about 8 of them iirc.
I'm a huge fan of David Weber and epic length novels in general. I read every book in the Safehold series and a new installment is long overdue. I also read every book in his Honorverse series, which is over 20 books long and enjoyed those immensely. The series is basically Horatio Hornblower in space. The main protagonist, Honor Harrington, even has the same initials.
Since i could not get Off Armaggedons Reef last year, i settled for another book from David Weber, random one there was being sold translated to local language, so i thought why not.
However, it turned out to be a mistake, as the book is part of the Honorverse series, as i later found out, however its one of the books from its spin-off sub-series, and not even the first one in there. Its called Storm from Shadow or something along the line, dont remeber the exact english name.
I tried my best to read it, but seems i miss lot of background not reading the previous books. And unfortunately, while i thought a book about interstellar politics and space combat would be right down my alley, it turns out its really not i guess. Maybe its the style of the author, but it seems to focus way too much on details of everything, minutae of said combat, extremely sophisticated dialogues, etc.. i dont know. Expanse i found way easier to read.
Anyway, just today my brother asked me what book i want for Christmas this year, so i checked the store and decided for Revelation Space by Alastair Reynolds. This time around, the first book in said series. Hopefully i am going to like it.