<P> In 1954 , Francis Cecil St Aubyn , 3rd Baron St Levan gave most of St Michael 's Mount to the National Trust , together with a large endowment fund . The St Aubyn family retained a 999 - year lease to inhabit the castle and a licence to manage the public viewing of its historic rooms . This is managed in conjunction with the National Trust . </P>
<P> In 1954 , Francis Cecil St Aubyn , 3rd Baron St Levan gave most of St Michael 's Mount to the National Trust , together with a large endowment fund . The St Aubyn family retained a 999 - year lease to inhabit the castle and a licence to manage the public viewing of its historic rooms . This is managed in conjunction with the National Trust . </P>
who lives in the castle at st michael 's mount
who lives in the castle at st michael 's mount
The St Aubyn family
The St Aubyn family