In 928, Adelaide, wife of the Duke of Burgundy and owner of the abbey in Romainmôtier, bequeathed it to the burgeoning Cluny Abbey, but the change of ownership never actually took place. Romainmôtier was only handed over to the Abbot Majolus of Cluny in the late 10th century.
The 10th and 11th centuries were marked by the struggle over land waged by the monks and noble families from the region, as each sought to expand their territory at the other’s expense. In September 1050, Pope Leo IX held a synod in Romainmôtier. He threatened to excommunicate the Lords of Grandson, who had seized control of the abbey and its lands.