well..i don't know any novels but here are some historical yaoi in mangas
http://www.mangago.me/read-manga/amefurashi_shunu_ni_shippori_to_nureru_ooedo_renaitan/
http://www.mangago.me/read-manga/tamayura_yuki_ringo/
those are really good, hope you will like it!
otherwise :
http://www.mangago.me/tag/Historical/?page=1
Hua hua you long
Here's the links for wattpad, but if you don't have an account there (which I highly recommend that you should) then you can also find them in live journal
https://www.wattpad.com/story/66855810-hua-hua-you-long-translation
War prisoner
https://www.wattpad.com/story/67379476-war-prisoner
Cold sand
https://www.wattpad.com/story/58667521-cold-sands
There's a lot more stories you can check out here
http://bltranslation.blogspot.com/p/links.html?m=1
Search from free novel websites then. They sure have rank, rated & genres.
(yaoi) historical novels