Hey

http://www.mangago.me/read-manga/ghost_child/

Kinda scary especially with the horror elements

http://www.mangago.me/home/mangalist/625264/

http://www.mangago.me/read-manga/mo_dao_zu_shi_novel/
http://www.mangago.me/read-manga/silent_lover/
http://www.mangago.me/read-manga/5_nin_no_ou/
http://www.mangago.me/read-manga/i_ren/

Hari no Hana. It kind of ended in a rush but it's a good read and the art is flawless. It also taught me a lot about medieval Japan.
http://www.mangago.me/read-manga/hari_no_hana/
Inariya-sensei pls marry me

Thanks everyone!

I like Momo to Manji, seems like the mangaka have done extensive research to keep it as authentic as possible. The author notes is a wealth of knowledge. If you are a history buff this is worth the read.
http://www.mangago.me/read-manga/momo_to_manji/

In below webtoon the art is just a feast for the eyes in al its full colored glory. It's historical fantasy tho.. took place in ancient China but I don't think it refer to any historical event/period.
http://www.mangago.me/read-manga/heaven_official_s_blessing/

Ennead is loosely based on Egyptian mythology. The webtoon piqued my interest on Egyptian mythology and I'm surprised when I found out that there is actually homosexual relationship between xxx and xxx in the original myth/scripture (I don't wanna give spoiler).
http://www.mangago.me/read-manga/ennead/

1001 Nights is loosely based on the Sahrazade/1001 Nights tale. There are a lot of historical stories and tale in it.. from ancient Greece, Egypt, India, China, Japan, Korea and of course Middle East.
http://www.mangago.me/read-manga/1001_nights/

This manga below took place in 1980s America. And the sequel in 1973 New York.
http://www.mangago.me/read-manga/rumspringa_no_joukei/
Sequel: http://www.mangago.me/read-manga/dear_gene/

Painter of the Night.. historical Korea, I think you must have read this already. The plot started to get interesting.
http://www.mangago.me/read-manga/yahwacheop/?pyOM

Wild Rock took place in fictional pre-historics era.
http://www.mangago.me/read-manga/wild_rock/

This manga below is a historical omegaverse. The art style looks similiar to the depiction of 18th century Europe.
http://www.mangago.me/read-manga/kakumei_no/