MICHAEL'S MOUNT, St., a granite rock in Mount's Bay, county of Cornwall, England, about three-quarters of a mile S. of Marazion; N. Lat. 50.7, W. Long. 5.28. It is of a pyramidal form, 250 feet in height, and about a mile in circuit, and is joined to the land by a causeway, which is covered by the sea at high water. This has been supposed by some to be the place called by the Greeks Ictis, from whence they obtained tin; but this opinion is by no means certain. As early as the fifth century a chapel was founded here, which was an object of pilgrimage; and remains of a Benedictine priory, founded by Edward the Confessor, are yet to be seen. It was fortified, and a place of some importance in former times; and was taken by John de Vere, a follower of the House of Lancaster, in 1471; by the Cornish rebels in 1548; and by Colonel Hammond, in the civil war in 1646. The Mount is still fortified, having 3 batteries and 18 guns. There is a small village on the lower part of the peninsula, with a population of 163.