Heyy keeper of the pearl is a historical omega verse, but the characters get reincarnated as city people. I hope this helps!
http://www.mangago.me/read-manga/willow_love_story/
http://www.mangago.me/read-manga/kakumei_no/
http://www.mangago.me/read-manga/gorani_jeon/
http://www.mangago.me/read-manga/keeper_of_the_pearl/ (their past lives were in a historical setting and we're shown them in like a part of the story but the main couple actually lives in the modern world)
Does it count historical? This is sad btw
http://www.mangago.me/read-manga/namida_kareru_na/
since no one noticed my post looking for a manga, is there a historical omegaverse?? if so pls rec