Entheseal changes are defined as bone modifications of the interface where tendons and ligaments meet bone (i.e. entheses). While they are widely used as activity markers by anthropologists, their study is far more rarely employed to explore past Human-Equid interactions. The inclusion of entheseal changes in zooarchaeological analyses can provide new insights into this subject, particularly with regard to the activities for which these animals were employed. A new scoring system based on 23 entheses located on the appendicular skeleton of equids is introduced. The study of 61 modern documented specimens shows that it is possible to distinguish (1) worked from unworked animals, and (2) the different functions for which some of them were exploited (riding, traction). Activity is not the only etiology involved in the development of entheseal changes: parameters such as age-at-death, body proportions and the environmental context must also be considered. This approach was then applied to the 21 horses found surrounding the tumulus of King Childeric I, who is thought to have died in 481-482 A.D., and excavated in the Saint-Brice district of Tournai (Belgium). In association with an exhaustive paleopathological study, analyses of entheseal changes contribute to the osteobiography of these equids and provide additional insight into their living conditions. The dental and skeletal health status of these animals was good when they died. In particular, entheseal changes argue in favor of the hypothesis that these horses were used as saddle animals. This research thus demonstrates the potential of entheseal changes to enhance the study of equid remains found in archaeological contexts. ; Les changements enthésiques correspondent à des atteintes des zones d’insertion des tendons et ligaments sur l’os (ou enthèses). Si ces altérations sont fréquemment employées comme marqueurs osseux d’activité en anthropologie biologique, ces dernières font l’objet d’un intérêt récent pour explorer les interactions entre l’Homme et les ...