How did William keep the English lords royal to him?

William the Conqueror kept the English lords loyal to him by implementing a system of feudalism, granting them lands in exchange for loyalty and military service. He also built castles throughout England, establishing a strong military presence that reinforced his authority. Additionally, William employed a strategy of integrating the Anglo-Saxon nobility, allowing some to retain their titles and lands, thus ensuring their cooperation and allegiance to his rule. This combination of land grants, military strength, and political integration helped maintain his control over the English lords.