Further indication of religious activities lies in that Sahure is the earliest known king to have used the Egyptian title of "Nb írt-ḫt". This title, possibly meaning "Lord of doing effective things", indicates that he personally performed physical cultic activities to ensure the existence and persistence of the Maat, the Egyptian concept of order and justice. This title remained in use until the time of Herihor, some 1500 years later. Sahure's reign is also the earliest during which the ceremony of the "driving of the calves" is known to have taken place. This is significant in the context of the progressive emergence of the cult of Osiris throughout the Fifth Dynasty, as this ceremony subsequently became an integral part of the Osiris myth. In subsequent times, the ceremony corresponded to Seth's threshing of Osiris by driving calves trampling fields of barley.