Christian-Muslim Relations 600 - 1500

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 Summa de haeresibus
(734 words)

Summa on heresies

Guido Terrena de Perpignan

Date: Early 14th century

Original Language: Latin


Guido begins with a section in which he defines heresy and discusses what the Church’s attitude towards heresy should be. He follows with a section on the 17 errors of the Jews, a section on the 26 errors of the Greeks, and the errors of the Jacobites, Georgians, and Armenians, who amass 30 errors between them. The…

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Tolan, John, “ Summa de haeresibus”, in: Christian-Muslim Relations 600 - 1500, General Editor David Thomas. Consulted online on 15 October 2019 <>
First published online: 2010

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