Abstract From the moment the first scholars tried to understand the events of Britain during the fifth and early sixth centuries, two British historical documents have been central to their efforts, the Historia Brittonum and the Annales Cambriae, both of which contained entries from a non-extant but generally accepted common source — the Northern Memorandum. Logically, learning as much as possible about the exact nature of that source would be of great use in better understanding post-Roman Britain. To begin rectifying the situation this article will review what is known about the background of the Northern Memorandum, Historia Brittonum, and Annales Cambriae. It will then explore the Historia Brittonum’s chapters and revisions and do the same with the Annales Cambriae entries up until the last northern British note. In each case the individual source(s), motivations, and date-range will be discussed. This exercise will be followed by a short discussion of the findings and one hopes a better understanding of both the Northern Memorandum and its derivatives.

中文翻译：

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北方备忘录的来源和贡献者及其继承者

摘要 从第一批学者试图了解 5 世纪和 6 世纪初英国的事件开始，两份英国历史文献一直是他们努力的核心，即 Historia Brittonum 和 Annales Cambriae，两者都包含来自非英国的条目。现存但普遍接受的共同来源——北方备忘录。从逻辑上讲，尽可能多地了解该来源的确切性质对于更好地理解后罗马不列颠非常有用。为了开始纠正这种情况，本文将回顾有关北方备忘录、Historia Brittonum 和 Annales Cambriae 背景的已知信息。然后，它将探索 Historia Brittonum 的章节和修订版，并对 Annales Cambriae 条目进行相同的处理，直到最后一个英国北部注释。在每种情况下，将讨论个人来源、动机和日期范围。在此练习之后将对调查结果进行简短讨论，并希望更好地理解北方备忘录及其衍生工具。