Stevens DB
The cited information was published by http://www.gendex.com/users/jast/index.html#Welcome, http://pss.fit.edu:80/~stevens/descent/ The author/originator was Jim & Luke Stevens.
Source Notes
Some data from Jim Stevens' son, Luke Stevens, who is also a contributor to the soc.genealogy.medieval newsgroup (Luke Stevens stevens@@pss.fit.edu)