How to pronounce “mercian” in English

We're moving into the period of the Mercian Supremacy, a period in the eighth century when the Mercian kings in the West

And again, he's called-- he was king of the Mercians, but the scribe in writing that has said, I, Aethelbald,

by gift of God, King, not only of the Mercians, but of all of the kingdoms which go by the general name South

So the scribe is conscious that Aethelbald is more than a king of the Mercians.