large chartulary (end of the 11th and beginning of the 12th century), and the small chartulary (middle of the 13th century), containing documents from 683 to 1336, document the economic importance of the abbey in the Middle Ages. Blessed Guillaume Grimoard, who was made abbot of Saint-Victor on 2 August 1361, became pope in 1362 as Urban V. He enlarged the church and surrounded the abbey with high crenellated walls. He also granted the abbot episcopal jurisdiction, and gave him as his diocese the suburbs and villages south of the city. Urban V visited Marseille in October 1365, consecrated the high altar of the church. He returned to St. Victor's in May 1367, and held a consistory in the abbey. The abbey began to decline after this, especially from the early 16th century, when commendatory abbots acquired authority. The loss of the important library of the Abbey of Saint-Victor, undocumented as it is, can probably be ascribed to the abuses of the commendatory abbots. The library's contents are known through an inventory of the latter half of the 12th century, and it was extremely rich in ancient manuscripts. It seems to have been dispersed in the latter half of the 16th century, probably between 1579 and 1591. It has been conjectured that when Giuliano di Pierfrancesco de' Medici was abbot, from 1570 to 1588, he broke up the library to please Catherine de' Medici, and it is very likely that all or many of the books became the property of the king. In 1648 the échevins (municipal magistrates) of Marseille petitioned Pope Innocent X to secularise the monastery, because of the unsatisfactory behaviour of the monks. The Pope was not willing to do so, but instead had the abbey taken over by the reformist Congregation of Saint Maur. Thomas le Fournier (1675–1745), monk of St. Victor's, left numerous manuscripts which greatly assisted them in their publications. However, the behaviour of the monks generally did not improve, and after their abysmal showing during the plague of 1720, during which they barricaded themselves inside their walls instead of providing any assistance to the stricken, Pope Benedict XIII secularised the monastery in 1726, converting it into a collegiate church with a community of lay canons under an abbot. This was confirmed by a bull of Pope Clement XII dated 17 December 1739. In 1774, it became by royal decree a noble chapter, the