It was then known as the langue d' oÃ l ( Oil languages ) . This was different from the langue d'oc ( Occitan language , also then called ProvenÃ al ) , whose territory bordered that of Old French to the south . It was then known as the langue d' oÃ l ( oÃ l language ) to distinguish it from the langue d'oc ( Occitan language , also then called ProvenÃ al ) , whose territory bordered that of Old French to the south .