In 1887, John Bartholomew's Gazetteer of the British Isles described Steep Holme Island like this:
Steep Holme Island, Somerset, in Bristol Channel, 5 miles W. of Weston super Mare, pop. 5; is 400 ft. high and 1½ mile in circumference, and had formerly a small priory founded in 1320.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Steep Holme Island has changed, please see our redistricted information for the modern district of North Somerset. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Steep Holme Island and units named after it.
GB Historical GIS / University of Portsmouth, History of Steep Holme Island in North Somerset | Map and description, A Vision of Britain through Time.
Date accessed: 26th January 2015
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Steep Holme Island".