Abstract
This article gives an account of the tracking process, palaeography, transcription and analysis of an Inquisition Court file opened in 1767 against don Carlos de Lorenzana under the charges of heresy and apostasy. The case was reported in Sonsonate. The results obtained show that during the centuries XVI and XVIII protestant ideas were already circulating through these lands, some with a clear Cathars influence. These ideas
were being propagated by foreigners who came to the Kingdom of Guatemala as result of the intense legal and illegal trade developed around Acajutla port. The copy of the document is safeguarded by the National Archives of El Salvador.

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