Upon the irruption of the Normans in the ninth century, this abbey shared the common fate of the Neustrian convents; and, like the rest, it rose from its ashes with greater magnificence, after the conversion of these barbarians to Christianity. Nicholas, the fourth abbot of the convent, son of Duke Richard II. and of Judith of Brittany, is said by Ordericus Vitalis to have commenced "a new church of wonderful size and elegance." But though he presided over the fraternity nearly sixty years, he did not live to see the building finished: the bringing of the task to perfection was reserved for William Balot, the next but one to him in the succession; and even he died in the very year of the dedication, which did not take place till 1126. This church, which it had cost eighty years to build, was suffered to exist but a short time after its completion: only ten years had elapsed from its dedication, when it fell a prey to a conflagration, which was at the same time destructive to the greater part of the city: another church, built shortly after, and chiefly by the munificence of Richard Coeur-de-Lion, shared the same fate in 1248. But even these repeated disasters in no wise abated the spirit of the monks: they had retired with the wreck of their property to one of their estates near Rouen, and there, by economy on their own part, and liberality on that of others, they soon found themselves in a state to undertake the erection of a fourth convent, of greater extent than any of the former, and to inclose it with high walls. The honor of laying the first stone of the new church, the same that is now standing, is attributed to one of the most celebrated of the abbots, John Roussel, more commonly known by the name of _Marcdargent_.[175] He had been elected to the prelacy in 1303; and, fifteen years afterwards, he commenced the structure. He presided over the monastery thirty-seven years, and was buried in the Lady-Chapel of the church, which he had completed as far westward as the transepts. The pomp with which his funeral was conducted, is recorded at length in the _Neustria Pia_; and the same work has also preserved the following inscription, engraved upon his coffin, which describes, with great precision, the progress made by him in the building:-- "HIC JACET FRATER JOANNES MARCDARGENT ALIAS ROUSSEL, QUONDAM ABBAS ISTIUS MONASTERII, QUI COEPIT ÆDIFICARE ISTAM ECCLESIAM DE NOVO; ET FECIT CHORUM ET CAPELLAS, ET PILLIARIA TURRIS, ET MAGNAM PARTEM TURRIS S. AUDOENI, MONASTERII DICTI."