Portrait of Britain: AD 1300 Bruce Campbell argues that a unique conjunction of human and environmental factors went into creating the crisis of the mid-14th century. Bruce Campbell | Published in History Today Volume 50 Issue 6 June 2000 Two men threshing sheaf, c. 1325-1335, from the Luttrell Psalter, Add. 42130, f.74v. British Library/Wiki Commons. To continue reading this article you will need to purchase access to the online archive. Buy Online Access Buy Print & Archive Subscription If you have already purchased access, or are a print & archive subscriber, please ensure you are logged in. Please email digital@historytoday.com if you have any problems.