1. The document Abbey record was written in the middle of the 9th century. It was written by the monks at Abbey.
The document is about the invasions on the Christians by barbarians and heathens and the troubles that were being caused.
2. This document type is an account of invasions and wars. It was written to discover the pattern of invasions and wars that were happening.
3. This document corroborates the textbook account of A. The reason it matches A is because of the similarity between both. Textbook A is about the lawlessness and turmoil that was persistent in Europe in the dark ages.
4. Yes I think it is a reliable piece of evidence. This is because, the accounts of C already said that the heathen invaded and broke into Christendom. This agrees with the barbarism that was described in A.
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