Shoukoku no Altair

Shoukoku no Altair (将国のアルタイル) is a manga written and illustrated by Kato Kotono.

Plot
Katou Kotono, a historian, presents a fantastic tale woven of intricate historical details set in a time of war.

Mahmut is a young Pasha serving on the general's council of Türkiye. The clouds of war are gathering over his country. With Türkiye's council split between the warmongers and the pacifists, Mahmut begins his quest to keep the peace at any cost. As he finds himself deeper and deeper in the politics of the ancient world, new enemies and allies surface. Who will prevail? What will Mahmut do if war proves to be inevitable?

Other Sources

 * MyAnimeList