Nikolaus Backes, Kardinal Simon de Brion (Breslau) 1910, used by H.K. Mann and J. Hollnsteiner, The Lives of the Popes in the Middle Ages XVI (London) 1932: 171–205., both quoted by Kay, Richard (1965). "Martin IV and the Fugitive Bishop of Bayeux". Speculum. 40 (3): 460–483 [p. 461f.] doi:10.2307/2850920. JSTOR2850920. S2CID163723072.
Nikolaus Backes, Kardinal Simon de Brion (Breslau) 1910, used by H.K. Mann and J. Hollnsteiner, The Lives of the Popes in the Middle Ages XVI (London) 1932: 171–205., both quoted by Kay, Richard (1965). "Martin IV and the Fugitive Bishop of Bayeux". Speculum. 40 (3): 460–483 [p. 461f.] doi:10.2307/2850920. JSTOR2850920. S2CID163723072.
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Nikolaus Backes, Kardinal Simon de Brion (Breslau) 1910, used by H.K. Mann and J. Hollnsteiner, The Lives of the Popes in the Middle Ages XVI (London) 1932: 171–205., both quoted by Kay, Richard (1965). "Martin IV and the Fugitive Bishop of Bayeux". Speculum. 40 (3): 460–483 [p. 461f.] doi:10.2307/2850920. JSTOR2850920. S2CID163723072.