Leo died in 741, and his son and heir, Constantine V (741–775), was personally committed to an anti-image position. Despite his successes as an emperor, both militarily and culturally, this has caused Constantine to be remembered unfavourably by a body of source material which is preoccupied by his opposition to image veneration. For example, Constantine is accused of being obsessive in his hostility to images and monks; because of this he burned monasteries and images and turned churches into stables, according to the surviving iconophile sources. In 754 Constantine summoned the Council of Hieria in which some 330 to 340 bishops participated and which was the first church council to concern itself primarily with religious imagery. Constantine seems to have been closely involved with the council, and it endorsed an iconoclast position, with 338 assembled bishops declaring, "the unlawful art of painting living creatures blasphemed the fundamental doctrine of our salvation--namely, the Incarnation of Christ, and contradicted the six holy synods. ... If anyone shall endeavour to represent the forms of the Saints in lifeless pictures with material colours which are of no value (for this notion is vain and introduced by the devil), and does not rather represent their virtues as living images in himself, etc. ... let him be anathema." This Council claimed to be the legitimate "Seventh Ecumenical Council", but its legitimacy is disregarded by both Orthodox and Catholic traditions as no patriarchs or representatives of the five patriarchs were present: Constantinople was vacant while Antioch, Jerusalem and Alexandria were controlled by Muslims, and Rome did not send a representative.