Historical Manga in no particular order
Gomanism (based jap imperialism but hard to find and all translations are probably pozzed)
Heureka (Archimedes in Syracuse)
Snow Ridge, Sword Dance (can't find this on MAL but I'm pretty sure it's historical chinkino) might be the following
Yuki no Touge, Tsurugi no Mai
Bokkou (chinkino siege defence)
Lone Wolf & Cub (series, samuraikino)
Hanzou no Mon (ninjakino)
Kubikiri Asa (samuraikino)
Thermae Romae (bath autism)
The Black Knight Story (can't find on MAL, pretty sure it's about medieval switzerland)
Kingdom, Li Mu, Meng Wu & Chu Zi (Kingdom series and offshoots. Chinkino)
Vagabond (samuraikino)
Ichigeki (boshinkino)
Historie (greekoid zoomerkino)
Otoyomegatari (churkakino)
Ad Astra: Scipio to Hannibal
Nobunaga no Chef
Genghis Khan (Yokoyama, Mitsuteru)
Golden Kamuy
Shiki (Yokoyama Mitsuteru, adaptation of Sima Qian's Shiji (Records of the Grand Historian))
Agrippa (Vercingetorix)
Arslan Senki (I think it's based on Alp Arslan but the translation and setting is twisted enough that I'm not sure)
Biao Ren (Sui Dynasty chinks)
Blood and Steel (wuxia chink stuff I think)
Jin
Plinivs
Song of the Long March and Shiyi Lu (chinkino)
Sōten Kōro (three kingdoms stuff)
The Ravages of Time (ditto)
Vinland Saga (vikangs)