English Common Law is a curiosity in that it does not match Anglo-Saxon Law nor French Law. There is a theory that the Normans needed a law of their own in England as Anglo-Saxon Law did not suit them. Fellow Normans had taken over Sicily from the Muslims and taken on the existing law there which was a Maghrebi Maliki (North African) form of Muslim Law. Juries and so forth.
In essence the idea is that the English Normans told their Sicilian Norman friends that they could do with a new complete set of laws and the Sicilian Normans wrote back 'here's one we found and use, try it (copy enclosed)'.
So English Common Law could be based upon a variety of Muslim Sharia law.
Or you could prefer to stick to plunging your head into boiling ploughshares (viz. '1066 And All That') or trial by combat (last done with Ashford v Thornton in 1818.)