King Offa was the King of Mercia (south of England) from 757 till 796 of the christian era.
He minted some coins with the first kalima engraved on them
Was he a bro, a broad hearted man, or was he doing islamic finance 'british style'? ... by making money off (andalusian) arabs by playing language tricks.
I shall eventually post a picture here of a replica.