A saga tells that around 1400 a man by the name of Mauritius from "the East" is said to have asked to be taken on as a monk in the Wiblingen monastery community. After he had proven himself for a year, Mauritius became a Benedictine monk. One day a fellow brother noticed that the foreign monk devoted himself to magic and the black arts at night in his cell. Mauritius fled from the subsequent imprisonment in a wondrous way, and not without having pronounced a curse. And, in fact, a storm lasting three days and three nights devastated the region and seriously endangered the monastery and its inhabitants. At the height of the flood an angel with the flag of the holy cross now appeared to the monks praying unceasingly. He lead the brothers out of the church in a procession, banished the rising water by striking the waves three times and rescued Wiblingen Monastery from ruin. Mauritius was found drowned between willow trees.
Guiseppe Garampi, who was sent to the peace conference in Augsburg as an unofficial representative of the pope in 1761, also visited Wiblingen Monastery on his journey, "(...) Wiblingen Monastery is new and rather elegantly built; the church will be rebuilt again soon. 30 to 40 monks usually live here. They show a large piece of wood from the holy cross, of which they maintain that they had purchased it at the time of Pope Urban II, to which, by the way, I remark that the authentic proof for it cannot be preserved due to the many fires and the tolerated hardship of the monastery (...)."
Up until 1701 the monastery founders in Wiblingen, the gentlemen von Kirchberg, were also in possession of the administrative rights. As such they were also authorized to demand corvée (enforced, unpaid labor of a peasant for his feudal lord). In 1398 this was limited for 5 years to 4 days a year in a contract between the Count of Kirchberg and the monastery. Those required to perform the service of driving horse or ox teams had to perform corvée 7 days a year from 1468. From 1701 the monastery abbot was able to demand 1 steer and 1 ram or their equivalent value every year from each taxpayer in the course of the meat tax. In addition, the Wiblingen innkeeper was obligated to have his beer supplied by the monastery.
"We now traveled along the Danube to the nearby Austrian monastery in Wiblingen (...). Prelate Roman received us with many, extraordinary honors and we were immediately led into the splendid church, the interior decoration of which is not yet completed (...). The church is large, decorated in an antique manner, the altars are also built with an antique taste and adorned with beautiful alabaster-like statues. (...)."
P. Johann Nepomuk Hauntinger OSB, Reise durch Schwaben und Bayern im Juli 1784