Japan, Chinese, Korean doesn't matter. I'm looking for something like Kingdom. I just discovered "The Ravages of Time" so it had me wondered if I'm missing more stuff like these. Its even better if it has romance/ seinen genres as well. Throw anything you know as long as it translated. Thanks.

You could try Basara, it's tagged "historical setting", it might be along the lines you're looking for.

Good luck ?

Assuming you're principally interested in action-y historical manga...
Ad Astra - Scipio to Hannibal
Golden Kamuy maybe
Historie
Gunka no Baltzar
Nobunaga Concerto
Nobunaga no Chef maybe
Shin Angyo Onshi
Shoukoku no Altair
Shut Hell
Vinland Saga

Chang Ge Xing, definitely - it's main focus is character growth, and has romance subplot. Unfortunately on hiatus currently, but there's still plenty to read already.

Donten ni Warau - Meiji period setting, fantasy elements

Seconding - Shoukoku no Altair

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