Dubious historical resources

The following is a canon of historical resources (often cited as though they were gospel) which may well be open to a considerable degree of question and must be used with the greatest of care:

• The [History of the Kings of England]? by [Geoffrey of Monmouth]?
• The Anglo-Saxon Chronicle
• The [Calendar of Saints]? (in any edition)
• The Liber Pontificalis
• Tacitus

/Talk