The abbot and monks, in proximity to the royal Palace of Westminster, the seat of government from the later 12th century, became a powerful force in the centuries after the Norman Conquest. The abbot often was employed on royal service and in due course took his place in the House of Lords as of right. Released from the burdens of spiritual leadership, which passed to the reformed Cluniac movement after the mid-10th century, and occupied with the administration of great landed properties, some of which lay far from Westminster, "the Benedictines achieved a remarkable degree of identification with the secular life of their times, and particularly with upper-class life", Barbara Harvey concludes, to the extent that her depiction of daily life provides a wider view of the concerns of the English gentry in the High and Late Middle Ages.[citation needed]

Who became a powerful force after the Norman Conquest?