The mischief rule of statutory interpretation is the oldest of the rules. The mischief rule was established in Heydon's Case [1584] EWHC Exch J36 Case summary. InRe Sussex Peerage, it was held that the mischief rule should only be applied where there is ambiguity in the statute. Under the mischief rule the court's role is to suppress the mischief the Act is aimed at and advance the remedy.