In order to maintain his power, Charles had to engage in continual struggles with various princes, both secular and ecclesiastical. Following his victory at Poitiers in 732, he attacked some unruly bishops including Eucherius of Orléans. Because of this, his memory suffered. During the ninth century, his tomb at the abbey of St. Denis is said to had been opened by the abbot, and a hideous dragon supposedly emerged from a blackened, charred and otherwise barren coffin; thus demonstrating Charles Martel's damnation for despoiling the Church of its property. Later historians at St. Denis said he had taken Church lands only temporarily and had intended eventually to reimburse and further enrich the Church.
Sounds like the abbot was very fond of the sacramental wine, if you ask me.