Nah, it was Langue d'Oil (or Norman/Anglo-Norman French, which I gather was a "coarser" variant). Richard I was raised in Aquitaine by his mother (Eleanor) and ruled there for some time before his accession as king, hence his Occitan leanings. (As far as I know, he's the only English king with a deep personal connection in southern France, despite England hanging on in Gascony for a couple centuries more.)Perhaps you are right and it was langue d´Oc and not langue d´Oil
[Edit: Oops, realized Isador already covered this. Sorry for the redundancy!]