He served as the provost of the cathedral of Reims from 1207 to 1217 and then as bishop of Beauvais from 1218 until his death in September 1234.

[2] Milo was the fourth son of Gaucher I, lord of Nanteuil-la-Fosse of the House of Châtillon.

[2] He combined an ambitious pursuit of ecclesiastical office with military service, the building of Beauvais Cathedral and the patronage of Jean Renart.

[3] In 1229, with Bishop Hugh of Clermont, Milo brought French troops to Italy at the request of Pope Gregory IX to fight against Frederick II, Holy Roman Emperor, in the so-called War of the Keys.

[5] Milo's last years were marred by a conflict in Beauvais between the burgers, the bishop and the king, Louis IX.