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JOHN XXI

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Originally appearing in Volume V15, Page 436 of the 1911 Encyclopedia Britannica.
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JOHN XXI . has been identified since the 14th See also:century, most probably correctly, with Petrus Hispanus, a celebrated Portuguese physician and philosopher, author of several medical See also:works—notably the curious See also:Liber de oculo, trans. into See also:German and well edited by A. M. Berger (See also:Munich, 1899), and of a popular textbook in See also:logic, the Surnmulae logicales. John XXI. is constantly referred to as a magician by ignorant chroniclers. See See also:Les Registres de See also:Gregoire X. et See also:Jean XXI., published by J. See also:Guiraud and E .Cadier in Bibliothegue See also:des ecoles frangaises d'Athines et de See also:Rome (See also:Paris, 1898) ; A. Petthast, Regesta pontif. See also:Roman., vol. 2 (See also:Berlin, 1875) ; F. See also:Gregorovius, Rome in the See also:Middle Ages, vol. v., trans.byMrs G.W. See also:Hamilton (See also:London,19oo-1902) ; R.Stapper, Papst Johann XXI. (See also:Munster, 1898) ; J.

T. Kohler, Vollstandige Nachrichf von Papst Johann XXI. (See also:

Gottingen, 176o). (C. H.

End of Article: JOHN XXI

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