historical yaoi manga

Historical: Kuroshitsuji, D. Gray Man, Hakkenden, Adekan (a couple have shounun ai overtones)

Historical dark yaoi? Or just dark yaoi? Or both?

Here's some historical yaoi, and some of it's a bit dark:

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

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

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

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

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

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

And here's a really dark one:

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