Waley, Daniel. The Italian City Republics (Longman, 1988)

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Excellent introduction to the complex world of the Italian city state, especially the different institutions involved.

Larner, John. Italy in the Age of Dante and Petrarch, 1216-1380 (Longman, 1980)

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This title has some good extracts about Frederick II from Salimbene translated into English.

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