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References
- ↑ Paolo Grillo, VELUT LEENA RUGIENS. BRESCIA ASSEDIATA DA FEDERICO II, http://www.rmojs.unina.it/index.php/rm/article/viewFile/127/108
- ↑ Van Cleve, Thomas (1972). The Emperor Frederick II of Hohenstaffen. Oxford. pp. 414–6.
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