Tavistock Abbey, also known as the Abbey of Saint Mary and Saint Rumon, is a ruined Benedictine abbey in Tavistock, Devon. Nothing remains of the abbey except the refectory, two gateways and a porch. The abbey church, dedicated to Our Lady and St Rumon, was destroyed by Danish raiders in 997 and rebuilt under Lyfing, the second abbot. The church was further rebuilt in 1285 and the greater part of the abbey between 1457 and 1458.