Yorkshire's Southern Boundary

Abstract

Henry Bolingbroke allegedly swore not to usurp the throne in Yorkshire in 1399 before going on to do so. Whether he committed perjury has divided historians of the past fifty years. Understanding of some old sources has improved and a new source has been discovered. This article reviews the evidence. It itemises each source in its original language and a modern translation as a foundation for future study. It suggests that Henry swore several oaths in different parts of Yorkshire and that originally there were options other than replacement of Richard II by Henry IV. It finds that all nine sources are interrelated. All date from the Percy revolt of 1403 or later. Some definitely do re-use Percy propaganda and others may. They cannot therefore be regarded as independent accounts of Henry's perjuries, which may nevertheless be true.