This work of unknown date, though later than July 1344 (after the Speculum regum), was intended to be an ‘eye salve for all Christians’ by destroying heresies. It is almost entirely based on canon law and has a theoretical quality, refuting some doctrines that had passed into history, though it also mentions Álvaro’s person…
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“ Collyrium fidei adversus haeresis”, in:
Christian-Muslim Relations 600 - 1500, General Editor David Thomas.
Consulted online on 21 January 2020 <http://dx.doi.org/10.1163/1877-8054_cmri_COM_24759>