For a very long time, teachers of the church treated the various discrepancies between the canonical Gospels through Gospel harmonies. The most influential and remarkable of these is Augustin’s De consensu evangelistarum. As for the Catholic Church, Augustin’s study weighed much heavier than biblical criticism, which – for the most part – originated in German Protestantism. In his memoirs, Alfred Loisy tells that in the late 19^th century, the archbishop of Paris, Cardinal Richard, encountered the modern Gospel criticism with a straightforward statement (Loisy, Memoirs I, 292): “There are no contradictions in the Gospels, because Saint Augustine has explained them.”

The latest and only critical edition of De consensus evangelistarum by Franz Weihrich (CSEL 43) stems from 1904. Weihrich consulted 20 manuscripts from 6^th to 11^th century, and he ranged them in four categories. He also used, at some instances, 19 manuscripts from 12^th to 15^th century. In the present guide, I have collected from digital catalogues 179 manuscripts; some 25% of them are now digitized (November 2017). I have marked the digitized manuscripts with a green open lock. My survey reveals that, in the past decades, libraries have digitized 24 manuscripts that Weihrich did not consult. Half of them stem from 6^th to 11^th century.

I do not imagine that my listing is exhaustive. Please kindly let me know of any shortcomings and mistakes you may find.

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