Pipe rolls now in the Cotton Library at the British Museum. Exactly when the Pipe rolls began to be produced is debated amongst historians. Some hold that they date from Henry I's reign, whether early or late in the reign, but others feel that they were introduced by King William I (reigned 1066–1087). The precursors of the records probably date to the Anglo-Saxon period, as the historian Pauline Stafford argues that financial records must have been kept in some form during the reigns of Cnut (reigned 1016–1035), Æthelred II (reigned 978–1016), and Edgar the Peaceable (reigned 959–975). There is a reference to
Edgar, King of Scotland in reference to the succession to the crown. Edgar, the king's eldest son, assumed it as his lawful right, but Donald, King Malcolm's brother, having usurped authority, opposed him with great cruelty, and at length the brave youth [Edgar] was murdered by his uncle. Alexander [I], however, his brother, slew Donald, and ascended the throne; being thus the avenger as well as the successor of his brother...". Benjamin Hudson dismisses the story as "completely false". But its existence points to the circulation of "incorrect" tales about the monarchs of the late 11th century. Verses of "The Prophecy of Berchán" allude