Christian-Muslim Relations 600 - 1500

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 Tractatus fidei contra diversos errores
(595 words)

Caput: Firmiter credimus

‘Treatise of the faith against various errors’

Benedict of Alignan

Date: Begun at some point in the 1240s, completed by 1261

Original Language: Latin


The Tractatus fidei is a lengthy theological treatise in three books, framed by the tenets and words of the opening canon of the Fourth Lateran Council (1215), ‘Firmiter credimus’. Book 1 focuses on the nature of the Trinity, Book 2 on the nature of C…

Cite this page
Arnold, John H., “ Tractatus fidei contra diversos errores”, in: Christian-Muslim Relations 600 - 1500, General Editor David Thomas. Consulted online on 28 January 2020 <>
First published online: 2010

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