Matthew Paris, J.A. Giles translation in English is the main one I believe. I have very roughly copied extracts from this regarding Frederick II. Visit http://standish.stanford.edu for the original documents.

Wikipedia entry for Matthew Paris

Cambridge History biography of Matthew Paris

I have  started to separate these extracts out by year – they are much more digestible this way. So far I have completed 1236 to 1239:

1239, part 2

1239, part 1

1238

1237

1236

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