In 800 the Danes plundered Tynemouth Priory,and afterwards the monks strengthened the fortifications sufficiently to prevent the Danes from succeeding when they attacked again in 832. However, in 865 the church and monastery were destroyed by the Danes. At the same time, the nuns of St Hilda, who had come there for safety, were massacred. The priory was again plundered by the Danes in 870. The priory was destroyed by the Danes in 875.The small parish church of St Mary remained. Earl Tostig made Tynemouth his fortress during the reign of Edward the Confessor. By that time, the priory had been abandoned and the burial place of St Oswin had been forgotten. According to legend, the St Oswin appeared in a vision to Edmund, a novice, who was living there as a hermit. The saint showed Edmund where his body lay and so the tomb was re-discovered in 1065. Tostig was killed at the Battle of Stamford Bridge in 1066 and so was not able to re-found the monastery as he had intended.