Kono Tabi, Reikoku Koushaku-sama no Hanayome ni Erabaremashita - Suterare Oujo no Danna-sama wa Dekiai ga Kakusenai!?

She is a rare master of the spiritual arts, but she is oppressed by those around her,
As a sacrifice, she is forced into a political marriage with a notorious "ruthless duke" from a neighboring country. However, Joshua, a childhood friend who comforted each other. When Meldt offers to treat Joshua the same way they used to, Joshua shakes his head, but the marriage is far more than Meld expected, but married life is much sweeter than Meld expected...?!

(From mangaupdates)