Born in
England, probably in
Leyden, England between
1583 and
1586 of unknown parentage, he may have been related to
John Allerton. He married
Mary Norris the same day his sister
Sarah Allerton married
Degory Priest.
Isaac Allerton, Mary Norris and their children Bartholomew, Remember and Mary were passengers on the Mayflower.
Isaac Allerton has a relatively small number of descendants, but these include Zachary Taylor and Franklin D. Roosevelt.
source: http://members.aol.com/calebj/