I like dramas with focus on real history or historical figures. Dramas like three kingdoms, cao cao and Confucius, no wuxia/xianxia/xianhuan.  Any recommendations?

The Imperial Doctress 

And this list might help: https://mydramalist.com/list/3rWpKQ94

Also it's not as old a setting as those but Battle of Changsha and City of Life and Death are historical dramas about the second Sino-Japanese War.