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The chronicle written successively by the two Prémontré Friesian Abbots, Emon and Menko de Wierum, covering the period 1204–“1273, is rich in information for those interested in observing natural phenomena in the Middle Ages, and particularly tidal waves. These two scholars, well-versed in the writings of the main naturalists of the period, show us to what extent intertextuality that faithfully reproduces, sometimes word for word, passages from the greatest scholars remains the best way to approach an explanation of such phenomena. Yet they also know how to judge both the limits of the natural sciences of their time and the role of Providence. All in all, in the middle of the Aristotelian century, these two scholarly monks were driven by a vision of the world and a philosophy of nature inherited in every way from Saint Augustine.