NOTE AND DOCUMENT

Abstract This article revisits the year book report of Pilkington's Case (1455), a much‐used source of information about Lancastrian parliamentary procedure. It shows that our understanding of this case can be considerably improved by comparing the report with the original private act and plea roll record. Most importantly of all, the article demonstrates that Pilkington's Case concerned a dispute over the crown's ability to amend acts by altering the royal assenting formula.