Episcopate and the Ottonian house
Theoderic belonged to the circle of imperial bishops who served the Ottonian emperors as both churchmen and counselors. A Saxon by background, he was a relation of Otto II and a cousin and friend of Bruno I, Archbishop of Cologne, ties that placed the see of Metz within the network of families closely bound to the reigning dynasty.
In 978 he performed the coronation of Charles, Duke of Lower Lorraine, as King of France at Laon, an act that drew the bishop into the dynastic contests of the West Frankish succession, although Charles was unable to secure wider acceptance of his claim.